| Diameter |
| 1968 – 1991: 28.5mm 1992 to date: 24.5mm |
| Weight |
| 1968 – 1991: 11.31g 1992 to date: 6.5g |
| Composition |
| 1968 – 2011: Cupro-Nickel 2012 to date: Nickel-plated Steel |
| Diameter |
| 1968 – 1991: 28.5mm 1992 to date: 24.5mm |
| Weight |
| 1968 – 1991: 11.31g 1992 to date: 6.5g |
| Composition |
| 1968 – 2011: Cupro-Nickel 2012 to date: Nickel-plated Steel |