Unworn, Omega Constellation Observatory, Ref# 140.53.39.21.99.002, box and papers.

The OMEGA Constellation Observatory Co-Axial Master Chronometer Ref. 140.53.39.21.99.002 is a remarkable celebration of OMEGA's enduring pursuit of precision and refined watchmaking. Crafted from luxurious 18K Sedna™ Gold, the 39.4 mm case showcases the collection's distinctive faceted "dog-leg" lugs and sharply defined bezel, paying tribute to the legendary Constellation models of the 1950s. The elegant pink "Pie-Pan" dial, also fashioned from 18K Sedna™ Gold, features a sun-brushed center, opaline dodecagonal facets, and eight hand-guilloché grooves that create exceptional depth and light reflection. Diamond-polished dauphine hands and redesigned kite-shaped indexes in 18K Sedna™ Gold are complemented by the applied OMEGA logo and iconic Constellation star. A domed, bevelled sapphire crystal with anti-reflective treatment on both sides ensures outstanding legibility, while the sapphire exhibition caseback reveals the exceptional OMEGA Co-Axial Master Chronometer Calibre 8915. Certified by METAS, this self-winding movement is the world's first two-hand calibre to achieve Master Chronometer certification, offering resistance to magnetic fields up to 15,000 gauss, a practical time-zone function, and a 60-hour power reserve. The movement is further enhanced by an 18K Sedna™ Gold skeletonized rotor and balance bridge, beautifully decorated with an applied Constellation Observatory medallion. Finished with a luxurious dark burgundy alligator leather strap.

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 Sedna™ Gold case
• Faceted fixed bezel and signature "dog-leg" lugs
• 18K Sedna™ Gold pink "Pie-Pan" dial with sun-brushed center, opaline facets, and eight hand-guilloché grooves
• Diamond-polished 18K Sedna™ Gold dauphine hands
• Diamond-polished 18K Sedna™ Gold 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: 96 g

Strap

• Dark burgundy alligator leather strap
• Grained calf leather lining
• 18K Sedna™ Gold pin buckle

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