U.S. Coins Three-Cent Silver (Trime) Minted: 1851–1873 Diameter: 17.9mm (fits 17mm holders snugly). Gold $2.50 Quarter Eagle (Classic Head) Minted: 1834–1839 Diameter: 17mm Composition: 90% gold. Foreign Coins Mexican Gold 2.5 Pesos Diameter: 17mm Composition: 90% gold. Swiss 10 Rappen Diameter: 17mm Composition: Copper-nickel. French 5 Centimes (Napoleon III) Diameter: Approximately 17mm Composition: Bronze. Austrian Gold 10 Crowns Diameter: 17mm Composition: 90% gold. British Gold 1/5 Sovereign Diameter: 17mm Composition: 22K gold. Bullion and Specialty Coins 1/10 oz Gold Bullion Coins Examples: American Gold Eagle (1/10 oz): 16.5mm (fits snugly into 17mm holders). Canadian Gold Maple Leaf (1/10 oz): 17mm. Mexican Libertad (1/10 oz): 17mm. Fractional Rounds Many private mints produce fractional gold or silver bullion rounds measuring 17mm. Summary Coins with a 17mm diameter include U.S. and foreign fractional gold coins, small copper and nickel coins, and modern bullion coins like the Canadian Gold Maple Leaf (1/10 oz). If you’re collecting coins or using 17mm Air-Tite holders, these coins will fit perfectly.
