Seamaster Aqua Terra 150m Co-Axial 43 Annual Calendar Red Gold / Grey / Bracelet

In Context

At 43 mm it is a large watch — well above this catalogue’s 40 mm median, and enough to dominate a narrow wrist. At 14.6 mm it is a tall case, and it will catch on a cuff. 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. 60 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.

231.50.43.22.06.001 stands on its own in this catalogue — no other reference here shares its base number. It pairs a grey dial with a red gold case. Beyond the time it carries an annual calendar.

The 8611 is the 8601 annual calendar with a gold rotor and balance bridge, the version for precious-metal cases. It powers 19 watches in this library. The [8601](/calibers/omega-8601) is the annual-calendar member of Omega's co-axial 8500 family, with the month at 3 o'clock, a silicon balance spring, two barrels for 60 hours, 39 jewels and a beat of 25,200 vph at 29 mm across; the calendar knows the length of every month except February. The 8611 is the same movement with its rotor and balance bridge made in gold, so that a display back on a gold case shows a matching movement. The glossary explains the [annual calendar](/glossary/annual-calendar). In the library it powers 10 [Aqua Terra](/brands/omega/aqua-terra) Annual Calendar references at 43 mm in gold and 9 [De Ville](/brands/omega/de-ville) Hour Vision Annual Calendars at 41 mm. 3 are limited editions. The [8501](/calibers/omega-8501) and [8521](/calibers/omega-8521) follow the same gold-rotor convention for the three-hand movements.

18 other watches in the library run the Omega 8611.

Omega

Seamaster Aqua Terra 150m Co-Axial 43 Annual Calendar Red Gold / Grey

231.53.43.22.06.001 · 43 mm

Omega

Seamaster Aqua Terra 150M Co-Axial 38.5 Annual Calendar Red Gold / Grey

231.53.39.22.06.001 · 38.5 mm

Omega

Seamaster Aqua Terra 150M Co-Axial 43 Annual Calendar Red Gold / Grey / Bracelet

231.50.43.22.06.003 · 43 mm

Omega

Seamaster Aqua Terra 150M Co-Axial 43 Annual Calendar Red Gold / Grey

231.53.43.22.06.003 · 43 mm