Omega Speedmaster ’57 40.5mm steel on leather strap

The Speedmaster is one of OMEGA’s most iconic timepieces. Having been a part of all six lunar missions, the timepiece is an impressive representation of the brand’s adventurous pioneering spirit.
This 40.50 mm model, inspired by the legendary 1957 original, features a stainless steel case and a black dial with recessed hour markers showing vintage Super-LumiNova from beneath. Along with rhodium-plated “Broad Arrow” hands, there is a date window at 6 o’clock, a small seconds subdial at 9 o’clock, and 12-hour and 60-minute chronograph recorders on the subdial at 3 o’clock.
The brushed bezel includes a blackened tachymeter scale, while on the caseback, there is a “Speedmaster ’57” engraving as well as a flat sapphire crystal with an anti-reflective treatment inside.
The watch is presented on a brown leather strap with an OMEGA logo in postive relief on the buckle, and is driven by the manual-winding OMEGA Co-Axial Master Chronometer Calibre 9906.
Features
Anti-magnetic
The movement is unaffected by exposure to strong magnetic fields, even those greater than 1.5 tesla (15,000 gauss).
Chronograph
The chronograph function is a mechanism for measuring time intervals. A chronograph watch can therefore be used to time events while displaying the time like any traditional watch.
Chronometer
Label given to a watch which has undergone precision tests and received a certificate from an official body.
Date
The day of the month, displayed in a window on a watch dial at the 3 or 6 o’clock position, or within a subdial at 9 o’clock.
Master Chronometer Certified
Guaranteeing the Swiss industry’s highest standard of precision, performance and magnetic-resistance, as set by the Swiss Federal Institute of Metrology.
Small seconds
A hand on a sub-dial which tracks seconds typically it completes a full rotation in one minute.
Tachymeter
A tachymeter watch has a function for measuring speed. It is a chronograph with a graduated dial on which speed can be read in kilometres per hour based on a 1000 metre distance.
Time zone function
Allows the hour hand to be easily adjusted to different time zones without stopping the watch.
Transparent caseback
A transparent caseback – frequently made of sapphire – makes it possible to see the movement inside the watch.
Technical Data
Reference
332.12.41.51.01.001
Between lugs 20mm
Lug-to-lug 49.6mm
Thickness 13.0mm
Case diameter 40.5mm
Case
Steel
Dial colour Black
Crystal
Scratch-resistant sapphire crystal with anti-reflective treatment on both sides
Water resistance
5 bar (50metres / 165 feet)
Total product weight (approx.)
80 g
Calibre: Replica OMEGA 9906
Movement Type Manual-winding
Power reserve 60 hours
Case Measurements
1. Between lugs This measures the space where a strap or bracelet would be placed.
2. Lug-to-lug
This is the full length of the case, from the top lugs to the bottom lugs.
3. Case diameter This is the full width of the watch’s case, excluding the crown and pushers.
4. Thickness When viewed from the side, this measures from the base of the watch to the surface of the glass.
Strap
Strap color Brown
Strap type Leather strap
Strap surface Non-grained calf leather
Strap underside Non-grained calf leather
Buckle type Pin buckle
Buckle material Stainless steel