| Diameter |
| 1935 – 1967: 36.00mm 1968 – 1987: 32.13mm 1987: 26.72mm (11 sided) 1988 – to date: 26.50mm (11 sided) |
| Weight |
| 1935 – 1967: 23.33g 1968 – 1987: 15.62g 1987 – 2012: 7.00g 2012 – to date: 6.27g |
| Composition |
| 1935 – 1967: .800 silver, .200 copper 1968 – 1987: nickel 1987 – 2012: .915 nickel, .085 bronze 2012 – to date: multi-ply brass plated steel |