4 Pounds - Elizabeth II The Hydra

The Pobjoy Mint, based in Surrey, has operated as a private mint producing coins under license for smaller territories since the 1960s, and the Isle of Man along with a handful of British Overseas Territories have been their primary clients for collector-focused issues. This piece is one in a series depicting the Labours of Hercules, a theme that has generated consistent secondary market demand among thematic bullion collectors rather than serious numismatists.

KM#25 attributes this to a specific issuing authority, though Pobjoy's licensing arrangements mean the legal tender status is largely nominal.