1 Crown - Elizabeth II 80th birthday of the Queen

The trimetallic construction here is genuinely unusual — three distinct gold alloys (red, white, and yellow) achieving their different hues through varying copper and silver content rather than plating or base-metal substitution. The Isle of Man has issued commemorative crowns prolifically since the 1970s, but all-gold trimetallic pieces occupy a very different tier of that output. Whether the 80th birthday occasion justifies the engineering is a matter of taste; the metallurgical execution is harder to dismiss.