Australian silver coinage follows a distinct "Pre-War" and "Post-War" split. Prior to 1946, Australian coins were minted in Sterling Silver (92.5%). This changed drastically after WWII, when the government was forced to debase the coinage to 50% silver to repay the United States for silver provided under the "Lend-Lease" program.
The most famous anomaly in Australian stacking is the 1966 Round 50 Cent. It was minted for only one year at 80% purity before silver prices made the coin worth more than its face value, leading to its replacement with the dodecahedral (12-sided) cupro-nickel version used today.
| Coin | Purity | Years | ASW (oz) |
|---|---|---|---|
| Crown (5/-) | 92.5% | 1937-1938 | 0.8410 |
| Round 50¢ | 80.0% | 1966 | 0.3416 |
| Florin (2/-) | 92.5% | 1910-1945 | 0.3364 |
| Florin (2/-) | 50.0% | 1946-1963 | 0.1818 |
| Shilling (1/-) | 92.5% | 1910-1945 | 0.1683 |
| Shilling (1/-) | 50.0% | 1946-1963 | 0.0910 |
| Sixpence (6d) | 92.5% | 1910-1945 | 0.0841 |
| Threepence (3d) | 92.5% | 1910-1945 | 0.0420 |