DiameterThe Diameter of ancient coins is usually expressed in millimeters. In FORVM’s catalog descriptions you will usually find the coin’s weight, then diameter, followed by the die axis. Since many Americans are not familiar with millimeters and because it can help anyone visualize size better, we provide comparisons to modern coins below.Diameters of Modern Coins for ComparisonU.S. Coins Euro CoinsU.S. Half dollar30.5 mm 2 euro25.75 mmU.S. Quarter 24.1 mm 1 euro23.25 mmU.S. Dime 17.9 mm 50 eurocent24.25 mmU.S. Nickel 21.3 mm 20 eurocent22.25 mmU.S. Penny 18.9 mm 10 eurocent19.75 mm 5 eurocent21.75 mm 2 Eurocent18.75 mm 1 Eurocent16.25 mmU.K. Coins 2 Pounds28.4 mm 1 Pound22.5 mm Fifty pence27.3 mm (7 sided) Twenty Pence21.4 mm (7 sided) Ten Pence24.5 mm Five pence18 mm Two pence 26 mm One pence20 mm
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DiameterThe Diameter of ancient coins is usually expressed in millimeters. In FORVM’s catalog descriptions you will usually find the coin’s weight, then diameter, followed by the die axis. Since many Americans are not familiar with millimeters and because it can help anyone visualize size better, we provide comparisons to modern coins below.Diameters of Modern Coins for ComparisonU.S. Coins Euro CoinsU.S. Half dollar30.5 mm 2 euro25.75 mmU.S. Quarter 24.1 mm 1 euro23.25 mmU.S. Dime 17.9 mm 50 eurocent24.25 mmU.S. Nickel 21.3 mm 20 eurocent22.25 mmU.S. Penny 18.9 mm 10 eurocent19.75 mm 5 eurocent21.75 mm 2 Eurocent18.75 mm 1 Eurocent16.25 mmU.K. Coins 2 Pounds28.4 mm 1 Pound22.5 mm Fifty pence27.3 mm (7 sided) Twenty Pence21.4 mm (7 sided) Ten Pence24.5 mm Five pence18 mm Two pence 26 mm One pence20 mm
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