Constellation Automatic 27.5 Stainless Steel / Red Gold / Diamond / MOP

In Context

At 27.5 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. 42 hours of reserve carries it overnight, but not through a weekend in a drawer. At 28,800 vph the seconds hand advances 8 times a second.

1397.76.00 stands on its own in this catalogue — no other reference here shares its base number. It carries a white dial.

The 2520 is Omega's small automatic of the 1990s and 2000s, an ETA 2000-1 with a rhodium-plated finish for the 27 mm to 29 mm ladies' cases. It powers 24 watches in this library. The ETA 2000 is the smallest of ETA's standard automatics, 19.4 mm across, and Omega's version runs at 28,800 vph with a 42-hour reserve and 20 jewels. It is the movement that gave the small Constellation and Aqua Terra a mechanical option beside the quartz calibers, in the years before Omega's own [8520](/calibers/omega-8520) arrived in 2010. In the library it powers 15 [Constellation](/brands/omega/constellation) references at 27.5 mm, including the "My Choice" models of the Cindy Crawford years, 7 [Aqua Terras](/brands/omega/aqua-terra) at 29.2 mm, one De Ville and one Seamaster Diver 300M. The [1376](/calibers/omega-1376) and [1456](/calibers/omega-1456) are the quartz movements of the same small Constellations, and the 8520 the in-house automatic that succeeded it.

23 other watches in the library run the Omega 2520.

Omega

Seamaster Aqua Terra 150M Automatic 29.2 Stainless Steel / Red Gold / Diamond / MOP / Bracelet

2365.75.00 · 29.2 mm

Omega

Seamaster Aqua Terra 150M Automatic 29.2 Stainless Steel / Red Gold / MOP / Bracelet

2373.70.00 · 29.2 mm

Omega

Seamaster Aqua Terra 150M Automatic 29.2 Stainless Steel / Diamond / MOP / Bracelet

2564.75.00 · 29.2 mm

Omega

Seamaster Aqua Terra 150M Automatic 29.2 Stainless Steel / MOP / Bracelet

2573.70.00 · 29.2 mm