1 Crown - Elizabeth II Bristol Blenheim 142

Issued to commemorate the Bristol Blenheim, the twin-engine light bomber that entered RAF service in 1937 and was, briefly, faster than any fighter in the world. By 1940 that advantage had evaporated completely, and Blenheim crews flew daylight raids against German-held targets at loss rates that were, by any measure, catastrophic. The aircraft's early obsolescence made its crews' continued operations all the more costly.

The Isle of Man issued numerous aviation crowns through the 1990s, many tied to KM series running into the hundreds of catalogue numbers.