Editorial
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.
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.
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.
