| Diameter |
| 1870 – 1953 (large date): 23.62mm 1953 (small date) – to date: 23.88mm |
| Weight |
| 1870 – 1910: 5.81g 1910 – 1968: 5.83g 1968 – 1989: 5.07g 1990 – 2001: 5.05g 2001P – to date: 4.40g |
| Composition |
| 1870 – 1919: .925 silver, .075 copper 1920 – 1967: .800 silver, .200 copper 1967 – 1968: .500 silver, .500 copper 1968 – 2001: nickel 2001P – to date: .940 steel, .038 copper, .022 nickel |