Unworn, Omega Constellation Observatory, Ref# 140.53.39.21.99.001, box and papers.

The OMEGA Constellation Observatory Co-Axial Master Chronometer Ref. 140.53.39.21.99.001 is a striking tribute to OMEGA's legendary history of precision timekeeping, combining vintage-inspired design with state-of-the-art mechanical innovation. Crafted from luxurious 18K Moonshine™ Gold, the 39.4 mm case features elegant faceted "dog-leg" lugs and a refined bezel that reinterpret the iconic Constellation models of the 1950s. The matching yellow "Pie-Pan" dial, also made from 18K Moonshine™ Gold, showcases a crystal-finished center, opaline dodecagonal facets, and eight hand-guilloché grooves that create remarkable depth and brilliance. Diamond-polished dauphine hands and newly designed kite-shaped indexes, crafted from 18K Moonshine™ Gold, are complemented by the applied OMEGA logo and the signature Constellation star. A domed, bevelled sapphire crystal with anti-reflective treatment on both sides protects the dial while offering exceptional clarity. Visible through the sapphire exhibition caseback is the exceptional OMEGA Co-Axial Master Chronometer Calibre 8915, featuring an 18K Moonshine™ Gold rotor and balance bridge adorned with an applied Constellation Observatory medallion. Certified by METAS, the self-winding movement offers resistance to magnetic fields up to 15,000 gauss, a convenient time-zone function, and a 60-hour power reserve. Finished with a luxurious brown alligator leather strap.

TECHNICAL DATA

Movement

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

Case

• Polished and brushed 18K Moonshine™ Gold case
• Faceted bezel and signature "dog-leg" lugs
• Yellow 18K Moonshine™ Gold "Pie-Pan" dial with crystal-finished center, opaline facets, and eight hand-guilloché grooves
• Diamond-polished 18K Moonshine™ Gold dauphine hands
• Diamond-polished 18K Moonshine™ 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: 99 g

Strap

• Brown alligator leather strap
• 18K Moonshine™ Gold pin buckle

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