Speedmaster Moonphase Chronograph (Master Chronometer)

The 304.33.44.52.03.001 is Omega's attempt to put a serious complication into the Speedmaster without disturbing its chronograph DNA, and it largely succeeds. The Cal. 9904 is a certified Master Chronometer movement, so you get COSC precision plus Omega's own magnetic-resistance standard, and the moonphase is accurate to one day in 122 years. This is not a sentimental Moonwatch tribute piece; it is a modern luxury chronograph with genuine horological ambition behind the subdial.

What it is

Omega introduced this reference in 2016 as part of the Speedmaster 44.25mm Master Chronometer family, positioning it above the standard Moonwatch in both complication and movement certification. The Cal. 9904 replaced earlier non-METAS-certified movements and brought 15,000 gauss magnetic resistance alongside the moonphase module. The lacquered dark blue dial with ceramic bezel distinguishes it clearly from the classic hesalite Moonwatch lineage.

Omega has kept the reference stable since launch with no major dial or caliber revisions, though limited editions and bi-color metal variants have appeared at retail. The 55-hour power reserve is a practical upgrade over earlier Speedmaster movements.

Buying notes

The ceramic bezel is scratch-resistant but chips at the edges if the watch has been knocked against hard surfaces; inspect the full circumference under magnification before buying. The chronograph pushers on used examples should engage crisply with no sponginess, as worn pushers on a co-axial escapement movement are expensive to rebuild. Confirm the moonphase disc has no dust intrusion under the dial crystal, since any debris here requires a full movement-out service to correct.

Ask for service history; the 9904 has co-axial components that benefit from documented maintenance, and an undisclosed service gap affects value. The lacquered dial does not age gracefully under ultraviolet exposure, so check for uneven color across the face on any watch stored without a box.

Market read

This reference trades at or slightly below retail on the secondary market, which means patient buyers can find clean examples under MSRP. The blue dial variant in steel is the most common and least scarce; limited editions with additional color combinations or precious metal accents hold value better. Omega's own certified pre-owned program has compressed the grey-market discount on these, so the spread between CPO and independent dealer pricing is narrower than it was in 2020.

Expect to pay a modest premium for unworn examples with full box and papers, but the floor on worn examples is soft.

Service expectations

The Cal. 9904 carries a recommended service interval of 5 to 8 years per Omega's current guidance. An authorized service runs roughly $800 to $1,200 USD depending on parts required, with the moonphase module adding cost if the disc or bearing needs attention. Independent watchmakers experienced with co-axial escapements can service this movement, but METAS certification is only reinstated through an Omega service center if that specification matters to you.