The Omega Seamaster 300 has a storied military heritage, most notably with the British Royal Navy, which commissioned a special version in 1967. This military issue was a modified Seamaster 300 featuring fixed lugs for a one-piece strap, an encircled “T” to denote tritium lume, and a large triangular marker at 12 o’clock for improved readability. These military watches, delivered between 1967 and 1971, were engraved with service identifiers such as “0552” for the Royal Navy or “W10” for the Army. The “Big Triangle” dial, paired with the broad sword hands, offers exceptional legibility and now displays a beautiful yellow patina on the lume. The use of tritium on the hands and indices is confirmed by the circled “T” on the dial — a hallmark reserved for true military dive watches. The bezel remains in excellent condition, showing no major defects or cracks. This exceptional tool watch is fitted with one of our Bulang and Sons single-pass nylon straps. Over the years, the case lost its original fixed bars — likely after its military service — perhaps to allow for the fitting of a metal bracelet. The caseback bears the military code “0552/923-7xxx A/347/70,” confirming delivery to the Royal Navy in 1970. Inside beats the automatic, red-gilded Omega Caliber 552 movement, which has been fully serviced by our watchmaker. Ready for its next mission, this Omega Seamaster 300 is a true military classic — as collectible as it is wearable. Built for men who don’t flinch at 50 metres under the Sea level and issued to those who actually earned the right to wear it — the Omega “Big Triangle” Seamaster isn’t just a handsome face, it’s proper military kit . Service-issued, battle-ready, and tough as they come. Don’t stall — a Royal Navy Seamaster doesn’t wait for stragglers. ⚓ Specifications: Omega Seamaster 300 165.024 British Royal Navy issued 42mm steel case wit twisted lugs and Case-back engraved “0552/923-7xxx A/347/70,” per MOD Specifications Arabic 12-6-9 layout, Circle-T dial Sword hands Calibre 552 automatic movement Bulang and sons single pass nylon strap Movement Serial 293xxxxx dating to 1968 Fully serviced by our watchmaker One-year mechanical warranty