50 Pounds - Elizabeth II 100 Years Royal Air Force

The RAF centenary in 2018 marked the merger of the Royal Flying Corps and the Royal Naval Air Service on 1 April 1918 — a bureaucratic unification that created the world's first independent air force, largely at the insistence of South African general Jan Smuts following his 1917 report on aerial warfare over London. The Isle of Man's status as a Crown dependency outside the UK Parliament gives it independent coinage rights, which it has used aggressively since the 1970s to produce large-format silver pieces aimed squarely at the collector market.

At 311 grams of .925 silver, this is a ten-troy-ounce issue.