| Diameter |
| 18.03mm |
| Weight |
| 1870 – 1901: 2.33g 1902 – 1936: 2.32g 1937 – 1968: 2.33g 1968 – 2000: 2.07g 2001 – to date: 1.75g |
| Composition |
| 1870 – 1919: .925 silver, .075 copper 1920 – 1967: .800 silver, .200 copper 1967 – 1968: .500 silver, .500 copper 1968 – 2000: nickel 2001 – to date: .920 steel, .055 copper, .025 nickel |