U.S. Coins
- Three-Cent Nickel
- Minted: 1865–1889
- Diameter: 18mm
- Composition: 75% copper, 25% nickel.
- Gold $2.50 Quarter Eagle (Liberty Head & Indian Head)
- Minted: 1840–1929
- Diameter: 18mm
- Composition: 90% gold.
Foreign Coins
- Mexican Gold 5 Pesos
- Diameter: 18mm
- Composition: 90% gold.
- Swiss 20 Rappen
- Diameter: 18mm
- Composition: Copper-nickel.
- Austrian 20 Heller
- Diameter: 18mm
- Composition: Zinc or other alloys (varies by year).
- Japanese 1 Sen (Meiji Era)
- Diameter: Approximately 18mm
- Composition: Bronze.
- French 10 Centimes (Napoleon III)
- Diameter: Around 18mm
- Composition: Bronze or copper.
- British 1/5 Sovereign
- Diameter: Approximately 18mm
- Composition: 22K gold.
Bullion Coins
- 1/10 oz Gold Bullion Coins
- Examples:
- American Gold Eagle (1/10 oz): 16.5mm (fits loosely in an 18mm holder).
- Canadian Gold Maple Leaf (1/10 oz): 17mm, but may fit 18mm holders snugly.
- Mexican Gold Libertad (1/10 oz): Fits 18mm holders well.
- Examples:
- Private Mint Rounds
- Many fractional gold or silver bullion rounds measure around 18mm.
Summary
Coins with an 18mm diameter include:
- U.S. Coins: Three-Cent Nickel and $2.50 Quarter Eagle Gold.
- Foreign Coins: Mexican Gold 5 Pesos, Swiss 20 Rappen, Japanese 1 Sen, and others.
- Modern Bullion: Fractional coins like the 1/10 oz Gold Maple Leaf and American Gold Eagle.