1 Crown - Elizabeth II William I, Silver Proof

Gibraltar has issued commemorative crowns prolifically since the 1970s, and by 1999 the series had grown so extensive that individual issues rarely carry strong numismatic premiums regardless of metal. This silver proof marks the 933rd anniversary of the Norman Conquest — an awkward number that suggests it was timed instead to coincide with the approaching millennium, bundling historical British themes into a broader commemorative programme aimed squarely at the collector market rather than circulation.