Constellation Co‑Axial Master Chronometer 27 Small Seconds Stainless Yellow Gold / Diamond / MOP

In Context

At 27 mm this is jewellery scale — a watch sized to be worn as an ornament rather than read across a room. The case back is open, so the movement is visible without taking the watch apart, and the sapphire crystal will resist everything short of deliberate abuse. 100 m is genuine swimming resistance — more than the shape of this watch suggests it would need.

The movement winds itself from the motion of your wrist. 50 hours of reserve is enough to set it down on Friday evening and find it still running on Monday. At 25,200 vph the seconds hand advances 7 times a second.

127.55.27.20.55.002 stands on its own in this catalogue — no other reference here shares its base number. It pairs a white dial with a yellow gold case.

Self-winding movement with Co-Axial escapement. Certified Master Chronometer, approved by METAS, resistant to magnetic fields reaching 15,000 gauss. Free sprung-balance with silicon balance spring. Automatic winding in both directions. Central hour, minute and small seconds hand. 18K Sedna™ gold rotor and balance bridge with Geneva waves in arabesque.