The pairing of Britannia with an American Liberty figure traces back to a 1989 joint initiative between the Royal Mint and the United States Mint — a diplomatically unusual collaboration that produced a two-coin proof set sold in both countries. That original partnership lapsed, but the Royal Mint has periodically revisited the concept unilaterally. The 2025 iteration marks the first such issue under Charles III, whose cypher replaced Elizabeth II's on Royal Mint products following her death in September 2022.
Struck in .9999 fine gold, this specification matches the standard established for Britannia bullion coinage since 2013, when the Royal Mint upgraded from .9167 fineness.
The pairing of Britannia with an American Liberty figure traces back to a 1989 joint initiative between the Royal Mint and the United States Mint — a diplomatically unusual collaboration that produced a two-coin proof set sold in both countries. That original partnership lapsed, but the Royal Mint has periodically revisited the concept unilaterally. The 2025 iteration marks the first such issue under Charles III, whose cypher replaced Elizabeth II's on Royal Mint products following her death in September 2022.
Struck in .9999 fine gold, this specification matches the standard established for Britannia bullion coinage since 2013, when the Royal Mint upgraded from .9167 fineness.