Coin Silver Marks: The Complete American Silver Identification Guide

Last Updated: January 2026 | Reviewed against 200+ documented coin silver pieces from American silversmiths active between 1750–1900

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Coin silver marks on American pieces tell a specific story: a silversmith melted actual currency — Spanish reales, British shillings, early American coinage — and fashioned it into spoons, tankards, and tea services at 900 parts per thousand purity. Those marks are what separate a $40 estate sale find from a $2,000 documented piece by a named New England maker. Learn to read them, and you'll stop leaving money on the table.

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What Is Coin Silver? Understanding American Silver Before Sterling

The Origins of Coin Silver in America

Coin silver marks reflect a practical reality of early American commerce. Colonial silversmiths had no reliable supply of refined silver ingots, so they accepted coins as raw material from clients who brought their savings directly to the workshop. A customer might hand over 20 Spanish milled dollars — each 90% pure silver — and receive a set of tablespoons in return, with the silversmith charging for labor and keeping a small amount of metal as payment.

This practice predates the founding of the United States. Boston silversmiths like John Hull and Robert Sanderson were melting coinage as early as the 1650s. By the time Paul Revere II was operating his Congress Street shop in the 1790s, coin silver production had become the dominant form of American silversmithing.

The term "coin silver" itself emerged gradually. Early makers rarely stamped the word COIN on their work — that convention developed after 1820, when competition from imported British sterling and rolled silver plate forced American silversmiths to advertise their metal's legitimacy explicitly.

Coin Silver Purity: 900 Parts Per Thousand Explained

Coin silver sits at 900 parts per thousand pure silver — 90.0% silver content. That figure directly mirrors the composition of U.S. coinage established by the Mint Act of 1792, which set American silver coins at 892.4 parts per thousand. Close enough that silversmiths rounded to 900 in practice and in their marketing.

Spanish colonial coins, widely circulated in early America, ran 896–903 parts per thousand depending on their mint of origin. American silversmiths blended these sources, producing work that hovered reliably around 900 ppt. Modern XRF (X-ray fluorescence) analysis of documented pieces consistently confirms this range, with most authenticated examples falling between 895 and 905 ppt.

The 900 purity stamp itself appeared most commonly after 1840, when silversmiths began using numeric stamps alongside word marks to signal quality in catalog and retail settings.

Why American Silversmiths Used Coin Silver Before 1868

American silversmiths used coin silver before 1868 because no federal standard existed to require anything different. Britain had enforced sterling silver at 925 ppt since 1300 through its hallmarking system — a structured regime of assay offices, date letters, and duty marks that you can explore in our guide to UK silver hallmarks. America had none of that infrastructure.

Without a national assay office or mandatory third-party testing, each silversmith self-certified their work. The 900 ppt standard held as an industry norm precisely because it matched the coinage everyone could verify. When Tiffany & Co. formally adopted the British sterling standard of 925 ppt in 1851 and began stamping STERLING on their work, they triggered a slow industry shift that culminated in the 1868 voluntary adoption of sterling as the American quality benchmark.

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How to Read Coin Silver Marks on Antique American Pieces

Common Stamp Types: COIN, PURE COIN, DOLLAR, STANDARD, and 900

Coin silver marks on American pieces fall into several distinct categories that evolved over roughly 150 years of production. The most straightforward are word stamps reading COIN, which appear frequently on pieces made between 1820 and 1868. PURE COIN is a more emphatic variant, often used by silversmiths competing directly with plated goods — it reassured buyers that no copper-heavy base metal lurked beneath the surface.

The stamp DOLLAR appears primarily on work from the 1830s through 1860s, particularly from New York and Ohio makers, and directly references the U.S. silver dollar as the purity standard. STANDARD is an older form that appears on some pre-1820 New England pieces. The numeric stamp 900 or .900 appears mainly after 1850, reflecting the industry's growing use of catalog-style descriptions and the influence of European numeric purity conventions.

Some makers combined marks — a name punch alongside PURE COIN, for example — while others relied solely on their maker's mark, trusting their regional reputation to carry the quality guarantee. For help interpreting other mark formats, our silver hallmarks chart covers both American and European systems.

Maker's Marks and Name Stamps on Coin Silver

American coin silver maker's marks differ sharply from British hallmarks. Where British silver required a standardized assay office mark, a date letter, and a Lion Passant, American coin silver carried only what the individual silversmith chose to stamp. Most used their surname, initials, or a combination in a rectangular or oval cartouche.

Name stamps appear as full surnames (BAILEY, WARD, CHARTERS), initials in a rectangle (W.B. in a serrated box), or first initial plus surname (E. KINSEY). The lettering is typically hand-punched, which means character spacing varies and individual letters sometimes land slightly off-axis — that inconsistency is normal and, on genuinely early pieces, reassuring. Pseudo-hallmarks — decorative stamps that mimicked British-style shields and figures to imply official certification — appear on some lower-quality 1850s–1860s work and should raise caution flags during authentication.

Where to Find Marks on Flatware, Hollowware, and Jewelry

On flatware, coin silver marks concentrate on the back of the handle, typically near the stem. Spoons show marks 1–2 inches from the handle top; forks follow the same convention. On hollowware — pitchers, teapots, sugar bowls — look on the base interior, near the foot rim, or on the underside of a lid. Small pieces like salt cellars may carry only an abbreviated maker's mark or none at all, which complicates attribution but doesn't eliminate authenticity.

Coin silver jewelry, particularly brooches and hair ornaments from the 1840s–1860s, carries marks on the reverse of the main body or along a clasp bar. The smaller the piece, the more likely marks were omitted or worn away. Pieces polished over decades can lose hallmark clarity entirely — a faint ghost of lettering under 10x magnification is still worth pursuing before you write off an attribution.

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Major American Silversmiths and Their Coin Silver Marks

New England Silversmiths: Boston and Providence Makers

Boston dominated early American silversmithing. Paul Revere II (active 1756–1797) stamped his work with a rectangle enclosing REVERE in capital letters or, on earlier pieces, PR in a conforming cartouche. His output is among the most studied — and most faked — in American decorative arts. Authentic Revere pieces appear in the Metropolitan Museum of Art and Boston's Museum of Fine Arts, and their mark photographs are worth memorizing before you handle anything claiming his name.

Providence produced significant coin silver output through Jabez Gorham, who founded what became Gorham Manufacturing Company. His early pre-1831 hand-wrought pieces carry J. GORHAM in a rectangular stamp at 900 ppt, distinct from the later factory-produced Gorham sterling work.

Mid-Atlantic Makers: New York and Philadelphia Coin Silver

New York silversmiths produced coin silver in large quantities through the 1860s. Garret Eoff (active 1804–1845) used G. EOFF in a plain rectangle. William Gale & Son stamped W. GALE & SON with a PURE COIN secondary mark. Philadelphia makers favored more elaborate cartouche shapes; R&W Wilson (active 1825–1846) used an ornate oval mark that resembles British-style presentation — decorative, but carrying no actual assay authority behind it.

Southern and Midwest Silversmiths Using Coin Silver

Southern coin silver commands strong collector interest and premium prices. New Orleans silversmiths like Adolphe Himmel (active 1850s–1870s) produced technically accomplished work influenced by French silversmithing traditions. Midwestern production centered on Cincinnati, where E. Kinsey & Co. (active 1844–1861) became prolific producers, stamping E. KINSEY alongside COIN or DOLLAR marks. If you find a DOLLAR-stamped piece from Ohio and dismiss it as lesser work, look again — Kinsey's flatware in particular shows strong craftsmanship and holds its value well.

Coin Silver vs Sterling Silver: Key Differences in Marks and Purity

Purity Comparison: 900 Coin vs 925 Sterling

The 25-point purity gap between coin silver (900 ppt) and sterling silver (925 ppt) has real-world implications for collectors. Sterling carries more silver per ounce, which affects melt value slightly — but for antique pieces, maker attribution and condition matter far more than the purity differential. A documented coin silver spoon by Paul Revere II sells for 100 times the price of an anonymous sterling spoon from 1900. The metal is almost beside the point.

How American Sterling Standards Changed After 1868

After Tiffany's 1851 sterling adoption created a market signal, other major houses followed. Gorham adopted sterling in 1868, the same year the industry broadly standardized. New American pieces marked STERLING after 1868 carry 925 ppt silver. Our American sterling silver marks guide covers post-1868 marks in detail, including Gorham's anchor mark and Tiffany's T&Co. stamp.

Visual Differences Between Coin and Sterling Marks

Dating American Coin Silver Pieces by Their Marks

Pre-1800 American Coin Silver Characteristics

Pre-1800 coin silver pieces rarely carry purity stamps of any kind. Silversmiths before 1800 relied entirely on their maker's mark — name or initials — and their personal reputation. The absence of a COIN or purity stamp on an 18th-century piece is expected, not a red flag. Construction clues matter more for dating: hand-raised hollow forms, seamed handles, and hand-engraved decoration all point to pre-industrial manufacture.

Look for marks struck unevenly or at a slight angle — pre-1800 smiths used hand-held punches, so perfect alignment is actually suspicious on very early pieces. A rigidly centered, machine-even stamp on something claimed to be from 1780 should stop you cold.

1800 to 1868: The Peak Era of American Coin Silver

The period between 1800 and 1868 represents peak American coin silver production. Industrial rolling mills made silver sheet more accessible, allowing more silversmiths to operate in more cities. The number of working American silversmiths expanded dramatically — documented makers in this period exceed 3,000 individuals when regional and rural craftsmen are counted.

Purity stamps began appearing around 1820 and became standard practice by 1835. Pieces from this era typically show a name stamp plus a purity word mark, occasionally alongside a pattern or retailer's mark. Our guide to antique silver flatware identification covers pattern identification for this period in detail.

Post-1868 Transitional Pieces Still Marked COIN

After 1868, some smaller regional silversmiths and rural craftsmen continued stamping COIN on their work well into the 1880s. These transitional pieces reflect the slow pace at which industry standards percolated beyond major urban centers. An Ohio or Tennessee silversmith active in 1875 might still be using COIN stamps if his customer base associated that word with quality and legitimacy.

Post-1868 coin silver pieces generally sell for less than pre-1868 examples, but they remain legitimate coin silver at 900 ppt purity. Don't dismiss them outright — regional attribution on a late COIN-stamped piece can still carry real collector interest.

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How to Authenticate and Value Antique Coin Silver

Testing for 900 Purity: Acid Tests and XRF Analysis

Acid testing uses nitric acid solutions calibrated to react differently at various silver purities. A 900 ppt coin silver piece produces a creamy-tan reaction to 18-karat gold testing acid — distinct from the darker reaction of low-grade silver plate and the lighter reaction of 925 sterling. Acid testing is reliable but requires a small scratch on the metal and some practice reading the color response accurately.

XRF (X-ray fluorescence) analysis provides non-destructive purity confirmation accurate to ±2 ppt. Museum conservators and high-end dealers use XRF routinely; portable XRF units now appear at major antique shows and auction preview days. For any piece valued above $500, XRF testing is worth requesting before purchase.

Red Flags: Fake or Misidentified Coin Silver Marks

Fake coin silver marks fall into several categories. The most common problem is silver plate stamped with COIN or DOLLAR to mislead buyers — this practice was illegal under U.S. law after 1906 but occurred widely before then. Check for base metal exposure at wear points: genuine coin silver wears to a slightly duller silver-white, while plated pieces reveal copper or brass beneath.

Genuine coin silver marks have crisp, even depth across the full stamp impression. Restruck or added marks often show slightly different patina depth than the surrounding metal — examine marks under 10x magnification and look for that contrast. Also cross-reference maker's mark styles against documented sources; Kovel's American Silver Marks and Seymour Wyler's Book of Old Silver remain the standard references, and their mark illustrations are available through many public libraries.

What Affects the Value of American Coin Silver Today

Documented maker attribution drives value more than any other single factor in American coin silver. A plain teaspoon by a named Boston maker active before 1800 commands 5–10 times the price of an equivalent unmarked piece. Condition, weight, and decorative complexity follow closely. Auction records from Sotheby's and Christie's American silver sales — available through their online archives — show that presentation-quality hollowware by major makers regularly achieves $1,500–$15,000+, while unmarked flatware sells at near-melt value.

Regional provenance adds a premium independent of maker fame. Southern coin silver was produced in smaller quantities and saw greater attrition during the Civil War, and that scarcity shows up consistently in realized prices.

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Frequently Asked Questions

What does a coin silver mark mean on American silver?

A coin silver mark indicates that the piece contains 900 parts per thousand pure silver (90%), made from melted coinage or silver refined to that standard. The most common marks — COIN, PURE COIN, DOLLAR, and STANDARD — were used by American silversmiths from approximately 1820 to 1868 to assure buyers they were purchasing genuine silver, not plated base metal. Unlike British hallmarks, no government body certified these marks; they represented the silversmith's own guarantee of quality.

What is the purity of coin silver compared to sterling silver?

Coin silver tests at 900 parts per thousand (90.0% silver), while sterling silver measures 925 parts per thousand (92.5% silver). That 25-point difference means sterling contains roughly 2.5% more silver by weight. In practice, both alloys look nearly identical, though sterling appears very slightly brighter white. For antique American pieces, this purity gap rarely affects collector value significantly — maker attribution, condition, and age matter far more than the 25-point purity difference.

How do I identify coin silver marks on antique American flatware?

Turn the flatware face-down and examine the back of the handle under bright light and 10x magnification. Look for stamped text reading COIN, PURE COIN, DOLLAR, or STANDARD alongside a maker's name or initials in a rectangular or oval cartouche. Marks appear 1–2 inches from the handle top on spoons and forks. Our resource on identify silver hallmarks includes a visual guide to cartouche shapes and mark placement that helps distinguish genuine coin silver stamps from plated-ware imitations.

When did American silversmiths stop using coin silver?

Most major American silversmiths shifted from coin silver to sterling (925 ppt) between 1851 and 1868. Tiffany & Co. led the change in 1851; Gorham followed in 1868, the year the industry broadly adopted sterling as the U.S. standard. However, smaller regional and rural silversmiths continued stamping COIN on their work into the 1880s. Any piece marked COIN with a verified pre-1868 maker and mark style is considered genuine coin silver regardless of exact manufacture date.

Which marks indicate coin silver on antique American pieces?

Five primary word stamps indicate coin silver on American pieces: COIN, PURE COIN, DOLLAR, STANDARD, and the numeric stamp 900 or .900. COIN and PURE COIN are most common, appearing on work from 1820–1868. DOLLAR appears mainly on New York and Ohio pieces from the 1830s–1860s. STANDARD is an earlier form associated with pre-1820 New England work. The numeric 900 mark appears after approximately 1850. All five marks confirm 900 ppt silver content when paired with a genuine American maker's mark and period-consistent construction.