Speedmaster Mark 4.5

In Context

At 41 mm it is sized to the current mainstream: 40 mm is the median across every watch measured in this catalogue. The case back is closed, so the movement stays out of sight, and the mineral crystal sits between the two — harder to scratch than plexiglass, easier to chip than sapphire. 60 m covers rain and hand-washing comfortably; it is not a watch to swim in.

The movement winds itself from the motion of your wrist. 48 hours of reserve is enough to set it down on Friday evening and find it still running on Monday. At 28,800 vph the seconds hand advances 8 times a second.

ST 176.0012 is one of 16 executions of the ST base reference. Underneath they are the same watch; what separates this one is a black dial and a stainless steel case. Beyond the time it carries a chronograph.

Omega

Black · Stainless Steel

ST 145.0022 · 42 mm

Omega

White · Stainless Steel

ST 145.0022 Alaska II · 42 mm

Omega

Grey · Stainless Steel

ST 145.014 · 41.75 mm

Omega

Brown · Stainless Steel

ST 146.011 · 41.5 mm

Omega

Silver · Stainless Steel

ST 168.0018 · 35 mm

Omega

Black · Stainless Steel

ST 176.0002 · 41 mm

Omega

Blue · Stainless Steel

ST 176.0002 B · 41 mm

Omega

Blue · Stainless Steel

ST 176.007 · 38.5 mm

+ 7 more variants in this family.

Omega's designation for the Lemania 5100, the automatic chronograph that ran through the tool watches of the 1970s and 80s. Its signature is a central minute counter — a long hand sweeping the whole dial rather than a subdial, far easier to read at a glance — alongside a 24-hour indicator. It replaced the 1040 in 1974 and stayed until the modular 1140 arrived.

1 other watch in the library runs the Omega 1045.

Omega

Speedmaster Automatic Stainless Steel / Black / Bracelet / Holy Grail

ST 376.0822 · 42 mm