OMEGA Speedmaster 4th Model, 42mm, Calibre 321 Manual-Winding Chronograph, 145.012

OMEGA Speedmaster Professional Ref. 145.012 is one of the most historically significant vintage Speedmasters, representing the final generation powered by the legendary Calibre 321 before OMEGA transitioned to the Calibre 861. Produced primarily during 1967 and 1968, the 145.012 belongs to the celebrated pre-Moon era and features the classic 42mm stainless steel case, black chronograph dial, tachymeter bezel, and traditional Hesalite crystal that define the early Speedmaster Professional. This example is particularly notable for its OMEGA Ref. 1039 stainless steel bracelet, one of the most desirable period-correct bracelets associated with vintage Calibre 321 Speedmasters. Produced from the mid-1960s into the early 1970s, the lightweight 1039 features distinctive flat folded links and semi-expanding links near the clasp. The 1039 is recognised as a correct bracelet for the Ref. 145.012 and adds considerable period character to the watch. At its heart is the legendary OMEGA Calibre 321 manual-winding chronograph movement. Based on the Lemania 2310 architecture and distinguished by its traditional column-wheel chronograph mechanism, the Calibre 321 is one of the most celebrated movements in OMEGA history. The 145.012 was the last vintage Speedmaster reference to use the original Calibre 321, making it particularly significant amongst collectors. Specifications Brand: OMEGA Model: Speedmaster Professional Pre-Moon Reference: 145.012 Year: Circa 1967–1968 Movement: OMEGA Calibre 321 Manual-Winding Chronograph Case Material: Stainless Steel Dial: Black Case Size: 42mm Bezel: Black Fixed Tachymeter Bezel Crystal: Hesalite Caseback: Solid Stainless Steel Bracelet: OMEGA Ref. 1039 Stainless Steel Bracelet Wrist Size: Fits up to 18cm Water Resistance: Not Guaranteed Due to Age Functions: Hours, Minutes, Small Seconds, Chronograph Accessories: None Condition: This is a vintage timepiece. Traces of usage can be seen, but it remains in acceptable condition for continued use. Availability: Global Concierge Sourcing Service Key Features Calibre 321 — Legendary OMEGA manual-winding column-wheel chronograph movement and the final Speedmaster Professional reference of its era to feature the original Calibre 321. 1039 Bracelet — Desirable period-correct OMEGA bracelet featuring lightweight folded construction and characteristic semi-expanding links. Pre-Moon Heritage — Produced during 1967–1968, placing the Ref. 145.012 firmly within the historic pre-Moon generation of Speedmaster Professional watches. Design — Classic black chronograph dial, tachymeter bezel, Hesalite crystal, and 42mm stainless steel case preserve the unmistakable appearance of the vintage Speedmaster Professional. Historical Significance — The 145.012 has direct Apollo-era credentials; examples of the reference were issued by NASA during the Apollo programme. The OMEGA Speedmaster Professional Pre-Moon Ref. 145.012 represents an important chapter in Speedmaster history as the final vintage reference powered by the original Calibre 321. With its period-correct Ref. 1039 bracelet, classic pre-Moon styling, and genuine Apollo-era heritage, this example offers significant appeal for collectors of vintage OMEGA chronographs. Available through our Global Concierge Sourcing Service. "Style is Timeless."