Omega Seamaster “Big Blue” 176.004 (1970–1972) Watch
Omega Seamaster “Big Blue” Reference: 176.004 Production: ~1970–1972 Nickname: Big Blue Category: Professional dive chronograph Core Specs Case: Stainless steel monobloc (front-loading) Diameter: ~46 mm Thickness: ~15.5 mm Water resistance: 120 m (original rating) Crystal: Mineral (originally) Movement: Omega Caliber 1040 Automatic chronograph Column wheel 22 jewels 28,800 bph Functions: Chronograph (12-hour totalizer) Central chronograph minutes Date at 3 Running seconds at 9 This was Omega’s first automatic chronograph movement , developed with Lemania (the same brain trust behind Speedmasters). Why It’s Called “Big Blue” Massive 46 mm case — absolutely enormous for the early ’70s Striking blue dial and blue anodized aluminum bezel Bold white hands and orange chronograph accents One of the loudest, most unapologetic dive chronographs ever made It wears huge , but in a very intentional, tool-wa...