Omega Speedmaster Calibre 321 Professional Chronograph 42 Ref. 311.90.42.30.99.002

Omega Speedmaster Calibre 321 Professional Chronograph 42 mm – Ref. 311.90.42.30.99.002

Overview

The Omega Speedmaster Calibre 321 Ref. 311.90.42.30.99.002 is the ultimate expression of the Moonwatch heritage, crafted in platinum Pt950Au20 with a distinctive onyx black dial featuring lunar meteorite subdials. Powered by the legendary Calibre 321, this timepiece fuses space history with haute horlogerie artistry.

Design & Materials

• Case: 42 mm asymmetrical Professional case in platinum (Pt950Au20 alloy with 20% gold), with sapphire crystal and exhibition caseback.
• Bezel: Black ceramic bezel with white enamel tachymeter scale, including the period-correct Dot Over 90 detail.
• Dial: Black onyx step dial with three grey lunar meteorite subdials; applied Omega logo and hour markers in 18K white gold.
• Bracelet: Platinum flat-link bracelet with folding clasp and fine adjustment system.
• Crystal: Scratch-resistant sapphire, front and back.
• Water Resistance: 50 meters (5 bar).

Movement

• Caliber: Omega Calibre 321, manual-winding chronograph, column-wheel controlled.
• Functions: Hours, minutes, small seconds; central chronograph seconds; 30-minute counter; 12-hour counter.
• Frequency: 18,000 vph (2.5 Hz).
• Power Reserve: Approximately 55 hours.
• Decoration: Sedna gold PVD-coated bridges, visible through sapphire caseback.

Technical Specifications

• Reference: 311.90.42.30.99.002
• Collection: Speedmaster Professional
• Case: Platinum Pt950Au20, 42 mm
• Bezel: Black ceramic with white enamel tachymeter scale (DO90)
• Dial: Onyx black step dial with lunar meteorite subdials
• Bracelet: Platinum flat-link bracelet with folding clasp
• Crystal: Sapphire crystal, front and exhibition caseback
• Water Resistance: 50 meters / 167 feet
• Movement: Calibre 321, manual-winding, ~55 hours power reserve
• Condition: New / Unworn
• Box & Papers: Omega presentation box and international warranty

Prestige & Value

The Speedmaster Calibre 321 Ref. 311.90.42.30.99.002 combines a historically faithful movement with precious-metal craftsmanship. Its onyx dial, meteorite subdials, and platinum construction make it a collector’s masterpiece—a Moonwatch redefined for connoisseurs of rarity and refinement.