Rare Omega Seamaster 300 “Big Triangle” Watch
Omega Seamaster 300 “Big Triangle” (Ref. 165.024, late 1960s) Why it’s rare: Issued to British Royal Navy divers ; easily recognizable by its large luminous triangle at 12 o’clock. Collectibility: Genuine military-issued pieces with “0552” and “W10” case engravings can reach $20,000–$50,000 .