2 Sovereigns - Elizabeth II Concorde 50th Anniversary

Concorde's first commercial flights launched simultaneously from London and Paris on January 21, 1976 — not 1969, the year of her maiden flight, which is the date the 50th anniversary calculation here actually tracks back to. The prototype 001 first flew on March 2, 1969, from Toulouse. Gibraltar has issued Concorde-themed gold pieces across multiple years, and this sits within a broader commemorative program rather than a singular issue.

The .917 fineness is standard crown gold, the same alloy used in sovereign coinage since 1817.