Speedmaster Day-Date 40 Stainless Steel / Black / Bracelet

In Context

At 40 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 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.

3220.50.00 stands on its own in this catalogue — no other reference here shares its base number. It pairs a black dial with a stainless steel case. Beyond the time it carries a chronograph and a day-date.

Omega's execution of the ETA/Valjoux 7751 — the 7750 variant that carries a full calendar rather than a date alone. That is what lets the Speedmaster Day-Date show a day of the week, which the plain 7750 cannot. It replaced the 1151 in the model. Actuation is cam-switched, the arrangement the 7750 family uses in place of a column wheel.

7 other watches in the library run the Omega 3606.

Omega

Speedmaster Day-Date 40 Stainless Steel / Silver / Bracelet

3221.30.00 · 40 mm

Omega

Speedmaster Day-Date 40 Stainless Steel / Blue / Bracelet

3222.80.00 · 40 mm

Omega

Speedmaster Day-Date 40 Stainless Steel / Yellow Gold / Silver / Bracelet

323.21.40.44.02.001 · 40 mm

Omega

Speedmaster Day-Date 40 Stainless Steel / Red Gold / Black / Bracelet

323.21.40.44.01.001 · 40 mm