Last updated: January 2026 | Reviewed by the AntiqueSilverHallmarks.com editorial team, with combined 10+ years of hands-on UK hallmark identification experience.
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A London silver hallmarks guide starts and ends with one institution: the London Assay Office, the oldest continuously operating precious metals testing body in the world. Since 1300, every piece of silver submitted to Goldsmiths' Hall in the City of London has received a set of punched marks that tell a precise story — who made it, when it was made, what metal it contains, and where it was tested. For collectors, estate sale shoppers, and dealers, learning to read those marks is the difference between paying fair value and overpaying for a reproduction.
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A Brief History of the London Assay Office
Founded in 1300: The World's Oldest Assay Office
The London Assay Office traces its legal authority to a royal statute of 1300 under Edward I, which required that all silver meet a minimum standard of purity before sale. The Goldsmiths' Company of London was charged with enforcement, and Goldsmiths' Hall became the physical place where silver was tested — which is exactly where the word "hallmark" originates. The Assay Offices Act 1423 reinforced this system by requiring silversmiths to register maker's marks, creating an unbroken documentary record that researchers still consult today using reference works like Jackson's Silver & Gold Marks of England, Scotland & Ireland.
How the Hallmarking Act 1973 Changed UK Silver Marking
Before 1973, the hallmarking system in the United Kingdom operated under a patchwork of centuries-old legislation. The Hallmarking Act 1973 unified and modernised the rules, establishing the British Hallmarking Council to oversee all four remaining UK assay offices. It standardised which marks were compulsory, introduced new sponsor's mark requirements, and made it a criminal offence to sell unhallmarked silver above a specified weight threshold in the UK. Any piece hallmarked after 1 January 1975 — when the Act came into force — follows a consistent modern format. You can explore the broader context of these changes in our full guide to UK silver hallmarks.
The London Assay Office Today
Today, the London Assay Office operates from its historic base at Goldsmiths' Hall, Foster Lane, London EC2. It hallmarks gold, silver, platinum, and palladium, and also offers testing services for antique pieces, export certificates, and diamond grading. The office hallmarks millions of articles each year, making London one of the busiest assay offices in Europe. Its records remain an authoritative primary source, and the office's own online resources complement third-party tools like our silver hallmarks chart for identification purposes.
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The Five Marks Found on London Silver
The Maker's Mark: Who Made Your Piece
The maker's mark — now formally called the sponsor's mark since the Hallmarking Act 1973 — identifies the individual or company that submitted the piece for assay. Before 1363, makers used pictorial devices; after that date, initials gradually became standard. By the 18th century, London silversmiths registered two-letter punches at Goldsmiths' Hall. A piece bearing "PL" in an oval shield, for example, identifies Paul de Lamerie, one of the most celebrated Huguenot silversmiths working in early Georgian London. Identifying maker's marks accurately requires cross-referencing with Jackson's or the online database held by the Goldsmiths' Company, because the same initials could belong to multiple registered makers across different decades.
The Standard Mark: Lion Passant for Sterling Silver
The Lion Passant — a lion walking to the left, right forepaw raised — has marked sterling silver in England since 1544. Sterling silver contains a minimum of 92.5% pure silver (925 parts per thousand). The Lion Passant appears on every piece of London sterling silver regardless of date, making it the single most reliable mark for confirming metal content at a glance. Learn more about its history and regional variations in our dedicated article on the lion passant hallmark meaning.
The Assay Office Mark: The Leopard's Head
The leopard's head is London's unique assay office mark. No other UK assay office uses it. This mark has appeared on London silver in various shield shapes since the 14th century and remains in use today. Its exact appearance — crowned or uncrowned, the shape of its shield — helps narrow down the date of a piece before you even consult a date letter chart. Get that detail fixed in your eye early; it saves time at every sale table.
The Date Letter: Pinpointing the Year of Hallmarking
The London Assay Office has used annual date letters since 1478, giving London silver one of the most precisely datable records of any decorative art medium in the world. Each letter corresponds to a single assay year, which runs from May to April rather than the calendar year. The cycle uses 20 letters of the alphabet (omitting J, V, W, X, Y, Z in most cycles), changes the letter style and shield shape with each new cycle, and restarts after approximately 20 years.
The Optional Commemorative and Duty Marks
Beyond the four compulsory marks, London silver sometimes carries additional optional or historically compulsory marks. The duty mark — a profile portrait of the reigning monarch — was legally required between 1784 and 1890 to show that excise duty had been paid. Commemorative marks, by contrast, are voluntary and celebrate specific royal events. Neither mark is compulsory today, but their presence can significantly affect dating and value.
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London Silver Date Letter Chart by Cycle
How the 20-Letter Alphabet Cycle Works
London date letters rotate through a 20-letter sequence, typically omitting J and the letters from V through Z. Each new cycle adopts a distinct combination of font style (Roman, italic, Gothic, Old English) and shield shape (square, oval, cusped, plain). Even a partially worn letter can often be placed within a 20-year window by shield shape alone — a practical skill that experienced dealers develop quickly. Pieces polished over decades can lose hallmark clarity, so shield outline sometimes tells you more than the letter itself.
Reading Date Letters from 1700 to 2026
The table below covers selected London date letter cycles from 1700 onward. For the full cycle-by-cycle breakdown with every individual year, consult our silver hallmarks chart.
| Date Letter Cycle | Years Covered | Shield Style | Font Style | Notes |
|---|---|---|---|---|
| Cycle 1700–1716 | 1700–1716 | Shaped/cusped | Roman capitals | Leopard's head crowned |
| Cycle 1716–1736 | 1716–1736 | Shaped/cusped | Roman lower case | Leopard's head crowned |
| Cycle 1736–1756 | 1736–1756 | Shaped/cusped | Old English capitals | Leopard's head crowned |
| Cycle 1756–1776 | 1756–1776 | Shaped/cusped | Roman lower case | Leopard's head crowned |
| Cycle 1776–1796 | 1776–1796 | Plain rectangle | Roman lower case | Duty mark introduced 1784 |
| Cycle 1796–1816 | 1796–1816 | Plain rectangle | Roman lower case | Leopard's head crowned |
| Cycle 1816–1836 | 1816–1836 | Plain rectangle | Roman capitals | Crown removed from leopard's head 1821 |
| Cycle 1836–1856 | 1836–1856 | Plain rectangle | Old English capitals | Duty mark used throughout |
| Cycle 1856–1876 | 1856–1876 | Plain rectangle | Old English lower case | Duty mark ends 1890 |
| Cycle 1876–1896 | 1876–1896 | Plain rectangle | Old English lower case | Uncrowned leopard's head standard |
| Cycle 1896–1916 | 1896–1916 | Plain rectangle | Roman lower case | Britannia Standard option available |
| Cycle 1916–1936 | 1916–1936 | Plain rectangle | Roman capitals | Silver Jubilee mark 1935 |
| Cycle 1936–1956 | 1936–1956 | Plain rectangle | Old English lower case | WWII assaying continued |
| Cycle 1956–1975 | 1956–1975 | Varied | Roman lower case | Hallmarking Act 1973 takes effect 1975 |
| Cycle 1975–1999 | 1975–1999 | Plain rectangle | Roman lower case | Post-1973 Act standardised format |
| Cycle 2000–2025 | 2000–2025 | Plain rectangle | Roman lower case | Millennium mark 2000; multiple jubilee marks |
Common Mistakes When Interpreting Date Letters
The most frequent error is reading a London date letter against the wrong cycle. Because font and shield shape change with every cycle, the letter "A" in a Gothic font inside a cusped shield belongs to a completely different year than "A" in Roman type inside a plain rectangle. A second common mistake is confusing the assay year with the calendar year — a piece hallmarked with the 1784 date letter was submitted for assay between May 1784 and April 1785. Always use both the letter and the shield shape together when identifying a date.
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The Leopard's Head: London's Most Iconic Mark
Crowned Leopard's Head: Pre-1821 Pieces
From the earliest recorded use of the leopard's head through to 1821, London silver carried a crowned leopard's head — a lion-like face in full frontal view, set beneath a heraldic crown. On pieces from the 17th and 18th centuries, the crown is clearly punched and often detailed enough to show individual points under a loupe. A Georgian silver teapot will typically show a crowned leopard's head alongside a date letter, the Lion Passant, and the maker's mark, all struck in a neat row along the back of the handle socket or inside the foot rim.
Uncrowned Leopard's Head: 1821 to Present
In 1821, the London Assay Office removed the crown from the leopard's head mark, and it has remained uncrowned ever since. The face itself retained its distinctive frontal, snarling expression, but the absence of the crown makes post-1821 pieces immediately distinguishable from earlier work under a loupe. Victorian and Edwardian London silver — the most commonly encountered antique silver in today's market — always carries the uncrowned version.
Why the Crown Was Removed
The precise official reasoning behind the 1821 change is not fully documented in surviving Goldsmiths' Company records. Silver historians generally connect it to a broader rationalisation of British hallmarking symbols during the early 19th century. Some researchers also note that the crowned leopard's head had become difficult to strike cleanly on smaller articles, and simplifying the design improved legibility on flatware and small wares. Whatever the administrative reason, the change created a reliable visual cut-off point that collectors use every day.
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How to Identify London Silver Hallmarks Step by Step
Tools You Need to Read Small Hallmarks
A 10x jeweller's loupe is the minimum tool for reading London hallmarks. Many Victorian flatware pieces carry marks no larger than 3mm across, and the date letter within that mark may be under 1.5mm. A 20x loupe helps with worn or rubbed marks. Strong raking light — shone at a low angle across the surface — picks up struck marks that appear invisible in flat overhead lighting. Wipe the area with a soft cloth to remove surface tarnish before you look; never use abrasive compounds near hallmark areas, because polishing can obliterate shallow strikes entirely. For a broader walkthrough of tools and techniques, visit our guide to identify silver hallmarks.
Step-by-Step Identification Walkthrough
1. Locate the marks. On flatware, check the back of the handle near the neck. On holloware (teapots, jugs, bowls), check the base, inside the foot rim, or on the underside of the lid.
2. Count the marks. Pre-1975 London silver typically shows three to five distinct punches in a row or grouped cluster.
3. Identify the leopard's head. Confirm the London assay office mark first — a frontal feline face. If crowned, the piece pre-dates 1821.
4. Identify the Lion Passant. Confirms sterling silver standard.
5. Read the date letter. Note both the letter and the shield shape, then cross-reference against a date letter cycle table.
6. Identify the maker's mark. Two or three initials, cross-referenced against Jackson's or the Goldsmiths' Company database.
7. Check for duty or commemorative marks. A monarch's portrait confirms a date between 1784 and 1890.
London vs Other UK Assay Office Marks Compared
| Assay Office | City Mark Symbol | Active Since | Still Operating |
|---|---|---|---|
| London | Leopard's head | 1300 | Yes |
| Birmingham | Anchor | 1773 | Yes |
| Sheffield | York rose (Tudor rose) | 1773 | Yes |
| Edinburgh | Castle (three towers) | 1457 | Yes |
| Chester | Three wheatsheaves and sword | 1686 | No (closed 1962) |
| Exeter | Three-towered castle | 1701 | No (closed 1883) |
| Newcastle | Three castles | 1423 | No (closed 1884) |
| York | Five lions on cross | c.1411 | No (closed 1857) |
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Special and Commemorative London Hallmarks
Jubilee Marks: 1935, 1977, 2002, 2012, 2022
London silver has carried voluntary commemorative marks for five royal jubilees. The 1935 Silver Jubilee of George V introduced a conjoined portrait of the king and queen. The 1977 Queen Elizabeth II Silver Jubilee mark showed a profile portrait of the queen. The 2002 Golden Jubilee, 2012 Diamond Jubilee, and 2022 Platinum Jubilee each introduced distinct marks approved by the British Hallmarking Council. These marks add provenance interest and can increase collector appeal, particularly on limited production pieces. They do not replace any of the four compulsory marks — they appear as a fifth or sixth punch.
Duty Mark: The Sovereign's Head Explained
Between 1784 and 1890, British law required a duty mark — a small intaglio portrait of the reigning monarch — on every piece of silver before it left the assay office. This mark proved that the maker had paid the silver tax. The duty mark changed with each new monarch: George III (1784–1820), George IV (1820–1830), William IV (1830–1837), and Victoria (1837–1890). A piece showing Victoria's youthful profile belongs to the first part of her reign; her older, more heavily lined profile appeared on later examples. The duty was repealed in 1890, and the mark immediately disappeared from London silver.
Britannia Standard Mark vs Sterling on London Silver
Between 1697 and 1720, the British government raised the required silver purity from sterling (92.5%) to Britannia Standard (95.84%) to prevent silversmiths from melting silver coins. London silver from this period carries a Britannia figure — a seated female figure — instead of the Lion Passant, and a lion's head erased (a lion's head with a ragged neck) instead of the leopard's head. After 1720, makers could choose either standard, though sterling quickly returned to dominance. Britannia Standard pieces command premium collector interest today. Full details appear in our guide to Britannia silver standard marks.
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Valuing and Collecting London-Hallmarked Silver
Does a London Hallmark Increase Value?
A London hallmark does not automatically command a premium over marks from other UK assay offices — a Sheffield or Birmingham hallmark on a piece by a celebrated maker carries equal legal weight for metal content confirmation. What London hallmarks do offer is the deepest documentary record of any UK office, which means provenance research is often more successful on London pieces. Pieces by recorded London makers — especially from the Georgian period — consistently achieve stronger auction results because buyers can verify the maker, the date, and the commission history more reliably than with less documented provincial work.
Most Sought-After London Silversmiths and Their Maker's Marks
Paul de Lamerie (registered 1712, mark "PL") remains the most consistently valuable London silversmith at auction, with documented pieces selling for six figures. Hester Bateman (registered 1774, mark "HB") produced elegant neoclassical work and remains highly collectible, with her pieces regularly appearing at major auction houses. Paul Storr (registered 1792, marks "PS" and later under Rundell, Bridge & Rundell) produced monumental Regency silver for royal and aristocratic clients. Any piece with a verifiable mark from these makers warrants professional appraisal before sale — and frankly, before you start telling anyone what you think it's worth.
Where to Get London Silver Professionally Appraised
The London Assay Office itself offers a testing and identification service for antique pieces. The Silver Society maintains a directory of specialist valuers. Major auction houses including Christie's, Sotheby's, and Bonhams all operate silver departments with specialist valuers who work from physical examination rather than photographs alone. For insurance appraisals, always use a valuer registered with the Royal Institution of Chartered Surveyors (RICS) or the Association of Professional Art Advisors (APAA). An appraisal based solely on photographs is not sufficient for high-value pieces.
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Frequently Asked Questions
What is the London Assay Office hallmark symbol?
The London Assay Office mark is the leopard's head — a frontal facing feline head, resembling a lion, struck within a shield. It has appeared on London-assayed silver since at least the 14th century and is the mark that distinguishes London-hallmarked pieces from those tested at Birmingham (anchor), Sheffield (Tudor rose), or Edinburgh (castle). No other assay office has ever used the leopard's head, making it the single most reliable identifier for London-origin assay work.
How do I read a London silver hallmark date letter?
Locate the date letter punch — a single alphabetical letter inside a shield — and note both the letter itself and the shape of the shield surrounding it. Match both against a London date letter cycle chart, because the same letter appears in every 20-year cycle with a different shield and font. The assay year runs from May to April, not January to December, so a piece dated "B" in a plain rectangle Roman type belongs to a different year than "B" in an Old English font inside a cusped shield.
What does the leopard's head mean on silver?
The leopard's head on silver confirms that the piece was tested and approved by the London Assay Office. It does not indicate metal purity on its own — that function belongs to the Lion Passant (sterling, 92.5%) or Britannia figure (95.84%). The leopard's head is purely an office mark, its origin tied to the arms of the Goldsmiths' Company of London, which has administered silver testing in the City since 1300. Its presence is a legal confirmation of assay, not a quality grade.
When did the London Assay Office stop crowning the leopard's head?
The London Assay Office removed the crown from the leopard's head in 1821. Every piece of London silver hallmarked before 1821 carries a crowned version of the mark; every piece from 1821 onward carries the uncrowned version. This single visual detail gives collectors and dealers an immediate approximate date range for any London piece without consulting a date letter chart, making it one of the most practically useful facts in everyday silver identification.
How can I tell if my silver was hallmarked in London?
Look for the leopard's head — a frontal feline face in a shield — among the row of punched marks. If the leopard's head is present, the piece was assayed in London. Confirm this by checking that no anchor (Birmingham), Tudor rose (Sheffield), or castle (Edinburgh) appears in the same group of marks. On pre-1975 pieces, you may also find the Lion Passant and a date letter nearby. A 10x loupe and strong raking light will reveal marks that appear invisible under flat lighting on tarnished or worn surfaces.