I have no idea if it is relevant but Lega was the trade name used by a Melbourne firm of manufacturing jewellers founded in 1948 and working until the 1980's. They are mostly known for 1950's sterling silver marcasite jewellery, but they also made "charms, badges and figures for sporting trophies, mostly cast in base metal and then plated with silver of gold."  (Cavill, C*cks & Grace p 153). I suppose they may also have made watch cases.