Unworn, Omega Constellation Observatory, Ref# 140.53.39.21.99.004, box and papers.

The OMEGA Constellation Observatory Co-Axial Master Chronometer Ref. 140.53.39.21.99.004 is an exceptional expression of modern haute horlogerie, celebrating OMEGA's legendary pursuit of chronometric precision. Crafted from exclusive 18K Canopus Gold™, the polished and brushed 39.4 mm case features distinctive faceted "dog-leg" lugs and a beautifully faceted bezel that reinterpret the design of the original 1952 Constellation. The stunning "Pie-Pan" dial, also fashioned from 18K Canopus Gold™, combines a crystal-finished center with opaline dodecagonal facets and eight hand-guilloché grooves, creating remarkable depth and elegance. Diamond-polished dauphine hands and redesigned kite-shaped indexes, all crafted from 18K Canopus Gold™, complete the refined display alongside the applied OMEGA logo and iconic Constellation star. A domed, bevelled sapphire crystal with anti-reflective treatment on both sides protects the dial, while the sapphire caseback reveals the magnificent Co-Axial Master Chronometer Calibre 8915. The movement is distinguished by its 18K Sedna™ Gold skeletonized rotor and balance bridge, enhanced by an applied Constellation Observatory medallion. Certified by METAS, the calibre delivers outstanding precision, resistance to magnetic fields up to 15,000 gauss, and a practical time-zone function, all supported by a 60-hour power reserve.

TECHNICAL DATA

Movement

• OMEGA Co-Axial Master Chronometer Calibre 8915
• Self-winding mechanical movement
• METAS-certified Master Chronometer
• Co-Axial escapement with silicon balance spring
• Twin barrels mounted in series
• Anti-magnetic to 15,000 gauss
• Time-zone function
• 18K Sedna™ Gold rotor and balance bridge
• Frequency: 25,200 vph (3.5 Hz)
• Power reserve: 60 hours

Case

• Polished and brushed 18K Canopus Gold™ case
• Faceted bezel and signature "dog-leg" lugs
• 18K Canopus Gold™ "Pie-Pan" dial with crystal-finished center, opaline facets and eight hand-guilloché grooves
• Diamond-polished 18K Canopus Gold™ dauphine hands and kite-shaped indexes
• Applied OMEGA logo and Constellation star
• Domed, bevelled scratch-resistant sapphire crystal with anti-reflective treatment on both sides
• Transparent sapphire crystal caseback
• Water resistance: 30 m / 100 ft (3 ATM)

Dimensions

• Case diameter: 39.4 mm
• Thickness: 12.23 mm
• Lug-to-lug: 47.20 mm
• Between lugs: 19 mm
• Approximate weight: 105 g

Strap

• Dark blue alligator leather strap with grained calf leather lining
• 18K Canopus Gold™ pin buckle

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