Omega Ref. ST 105.003-65, chronograph, minute and hour counters, calibre 321; “Speedmaster”; stainless steel | Important Modern & Vintage Timepieces | Monaco, July 21, 2021 OmegaRef. ST 105.003-65, chronograph, minute and hour counters, calibre 321; “Speedmaster”; stainless steel, Stainless steel, manual-winding, tonneau-shaped, gentleman’s wristwatch, water-resistant with screwed case-back, bezel with black insert, black colour dial with subsidiary seconds at 9 and three horological complications:• 1/5 second chronograph (activated by the two round-shaped push-pieces) with tachometric scale graduated on the bezel for 500 units per hour• Half-instantaneous 30-minute counter (subsidiary dial at 3 o’clock)• 12-hour counter (subsidiary dial at 6 o’clock)
