Speedmaster Moonphase Co-Axial Master Chronometer Chronograph 44.25mm

Model #: 304.

Mens Watch | Automatic Movement

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Watch Specifications

Brand Omega
Series Speedmaster Moonphase Co-Axial Master Chronometer Chronograph 44.25mm
Model Number 304.
Size Mens
Case Material Stainless Steel
Dial Colour Black
Bracelet/Strap Alligator/Crocodile Leather Black
Clasp Push Button Deployant Buckle
Movement Automatic - Chronometer
Bezel Fixed
Screw-down Crown No
Crystal Scratch Resistant Sapphire
Case Back Transparent
Water Resistance 100m/330ft
Diameter 44.25mm

Watch Description

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

Stainless steel bezel ring with with polished black ceramic fill & satin finished Liquidmetal Tachymeter scale.

Metallic black dial with a fine sunburst finish.

Applied index hour markers with luminescent fill.

Printed white minute/seconds & fractions of a second track.

Polished hour & minute hands with luminescent fill.

Chronograph Stopwatch functions:

Large central seconds hand counter with luminous spear-head tip .

Minute (steel) & hour (white) hand counters are combined into a single sub-dial located at the 3 o'clock position.

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

Date displayed on the perimeter of the sub-dial at the 9 o'clock position, indicated via the red circular tipped hand.

Moonphase display sub-dial at the 6 o'clock position. The moonphase features two infinitely small yet photo-realistic moons on a metallic crystal disc microstructured to obtain a high resolution image of the moon.


Omega Master Co-Axial caliber 9904, beats at 28,000 vph (4Hz), contains 54 Jewels & has an approximate power reserve of 60 hours, courtesy of its twin barrels mounted in series.

Swiss Federal Institute of Metrology (METAS) certified Master-Chronometer. The finished watch, with its COSC chronometer movement, passes tests that replicate real-life wearing conditions. The METAS certification tests water resistance, precision and magnetic resistance to 15,000 gauss.

Anti-magnetic: resistant to magnetic fields greater than 15,000 gauss. In addition to measuring the performance of the watch in daily wearing conditions, the process also ensures that the watch and its movement function properly when exposed to magnetic fields of 15,000 gauss.

Features Omega's Si14 silicon balance spring that improves resistance to shock and magnetism and thus to sustained reliability.

The movement also features Omegas 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 intervals required between servicing.

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

This Watch has an alternate part number:

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