Seamaster Aqua Terra 150M Master Chronometer Small Seconds 38 Sedna Gold / Diamond / Purple Jade / Bracelet

In Context

At 38 mm it sits just under the modern norm — the band that suits the widest spread of wrists. 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. 150 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. 55 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.

220.55.38.20.99.001 stands on its own in this catalogue — no other reference here shares its base number. It pairs a purple dial with a sedna gold case. Introduced in 2021.

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. Small Seconds display at 6H. 18K Sedna™ gold rotor and balance bridge and luxury finish with Geneva waves in arabesque.

3 other watches in the library run the Omega 8803.

Omega

Constellation Master Chronometer Small Seconds 34 Sedna Gold / Diamond / Black / Bracelet

131.55.34.20.61.001 · 34 mm

Omega

Constellation Master Chronometer Small Seconds 34 Sedna Gold / Diamond / Black

131.58.34.20.61.001 · 34 mm

Omega

Seamaster Aqua Terra 150M Master Chronometer Small Seconds 38 Sedna Gold / Diamond / MOP / Alligator

220.58.38.20.55.002 · 38 mm