1 Dollar - Charles III Pigling Bland

Pigling Bland, the Beatrix Potter character from her 1913 story, entered public domain in the UK only in 1994 — forty years after Potter's death — triggering a wave of licensed and unlicensed merchandise that eventually reached numismatic issues. The Solomon Islands has served as the issuing authority for scores of such collector rounds dressed as legal tender, where the nominal face value is purely nominal and the real market is bullion and novelty buyers.

At 2.5 grams, this sits below the weight of a standard half-sovereign.