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Omega Speedmaster Moonphase Co-Axial Master Chronometer... 304.

Omega Speedmaster Moonphase Co-Axial Master Chronometer... 304.


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Condition New/Unworn
Case Shape Round
Case Dimensions 44.25mm
Case Material Stainless Steel
Dial Color Black
Crystal Scratch Resistant Sapphire
Bezel Fixed
Screw-in Crown No
Water Resistance
No rating Does not allow contact with water
30m/99ft - 50m/165ft Allows for contact with water such as washing hands and rain
50m/165ft - 100m/330ft Allows for light poolside swimming
100m/330ft - 200m/660ft Allows for swimming, snorkeling and showering (do not expose to hot water)
200m/660ft - 500m/1650ft Allows for impact water sports such as board diving and scuba diving
500m/1650ft + Appropriate for serious deep water diving.

Learn more about Water Resistance.

Case Back Transparent
Band Material Stainless Steel
Color/Finish Brushed & Polished
Clasp Push Button Folding Clasp
Movement Automatic - Chronometer
Complications Chronograph, Moonphase
COSC Certified Yes
  • Brushed/Satin finished stainless steel case with polished finished beveled corners.
  • Stainless steel bezel ring with with polished black ceramic fill & satin finished Liquidmetal Tchymetre scale.
  • Metaliic 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 perimieter 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.
  • Movement:
    • Omega Master Co-Axial caliber 9904, beats at 28,000vph (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,  withits 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

Alternate model # 30430445201001

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