10 Pence - Elizabeth II Quincentenary of the College of Arms, Platinum Proof

The College of Arms — the English heraldic authority incorporated by Richard III in 1484 — celebrated its quincentenary in 1984, prompting a wave of commemorative issues across British-adjacent territories eager to mark the occasion. The Isle of Man's participation was characteristically ambitious: the same design was struck across multiple metal variants, with platinum sitting at the apex of a hierarchy that also included gold, silver, and base metal versions.

At 25 grams in .950 platinum, this is a substantial piece for a nominal 10 pence denomination — the face value is essentially ceremonial fiction.