Speedmaster '57 Co-Axial Chronograph 41.5mm

Model #: 331.

Mens Watch | Automatic Movement

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Watch Specifications

Brand Omega
Series Speedmaster '57 Co-Axial Chronograph 41.5mm
Model Number 331.
Size Mens
Case Material Stainless Steel
Dial Colour Blue
Bracelet/Strap Calfskin Leather Brown
Clasp Push Button Folding Clasp
Movement Automatic - Chronometer
Bezel Fixed
Screw-down Crown No
Crystal Anti-Reflective Scratch Resistant Sapphire
Case Back Transparent
Water Resistance 100m/330ft
Diameter 41.5mm
Case Thickness 16.5mm

Watch Description

A tribute to the original Omega Speedmaster watch from 1957, with clean-cut designs, straight lugs presented on a brown leather strap:

Brushed/Satin finished stainless steel case with polished finished beveled edges.

Brushed finished bezel with engraved and black-filled tachymeter scale.


PVD blue main dial with recessed blue sub-dials.

Applied silver-tone index hour markers with luminescent fill.

Printed white minute/seconds and fractions of a seconds track.

Polished silver-tone hands, with hour and minute hands containing luminescent fill.

Chronograph Stopwatch functions:

Large central seconds hand counter.

Minute and hour counters are combined into a single sub-dial located at the 3 o'clock position. Both hands are filled with luminescence.

Small continuous running seconds hand sub-dial located at the 9 o'clock position.

Date window displayed at the 6 o'clock position.

Slightly domed sapphire crystal.


Omega caliber 9300, beats at 28,800 vph, contains 54 Jewels & has an approximate power reserve of 60 hours - thanks to its twin barrels mounted in series.

Column-Wheel Chronograph - column wheel is visible from the transparent case back.

The movement features Omega's "Si 14" silicon balance spring, which contributes to the movements outstanding resistance to shock and to environmental disturbances and thus, to the watch’s chronometric performance.

The movement also features the now-standard Co-Axial Escapement which contributes to greater precision, stability & durability. The Co-Axial escapement has less friction & reduces the necessity of lubrication thus reducing the time required between servicing.

The combination of the SI 14 balance spring & the Co-Axial escapement makes for an extremely reliable & stable movement.

The rotor & visible bridges are decorated with a unique "arabesque" wave design finish.

This Watch has an alternate part number:

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