100 Dollars - Elizabeth II 4th Portrait - Australian Nugget - Gold Bullion Coin

The "Pad Printed" designation in the composition field marks this as one of the more technically unusual issues in the Australian Nugget series. Perth Mint introduced pad printing — a process borrowed from industrial manufacturing — to apply color elements directly onto the gold surface, a technique controversial among purists and rarely adopted by sovereign mints at the time.

The Australian Nugget program itself launched in 1986, initially depicting actual gold nuggets found on Australian soil. By 2001, the series was well-established as a globally traded bullion instrument, with the .9999 fineness exceeding the standard .999 purity carried by most international competitors.