The Omega Speedmaster Moonphase 304.23.44.52.13.001 is the steel and Sedna gold version of the Speedmaster Moonphase Co-Axial Master Chronometer Chronograph: a 44.25 mm case with a brown ceramic bezel, a brown dial with two counters and a moonphase at 6, the automatic calibre 9904 with METAS Master Chronometer certification, and a brown leather strap. Omega introduced the Moonphase Master Chronometer line in 2016 as the dressier, more complicated cousin of the Moonwatch, and this two-tone reference is the one chosen by buyers who want the warmth of Sedna gold without the price of the solid gold case. This guide covers the specifications, what the calibre 9904 does, how the two-tone compares with the all-steel Moonphase and the Racing two-counter in Sedna gold, how a 44.25 mm Speedmaster wears, price context in 2026 and what to check before buying. Bizak & Co. sources this reference to order; the Speedmaster collection lists the configurations we can seek.
Last reviewed on October 17, 2026 by Filip Biczak. Prices are dated observations, not quotes.
Omega Speedmaster Moonphase 304.23.44.52.13.001 specifications
| Attribute | 304.23.44.52.13.001 |
|---|---|
| Case | 44.25 mm stainless steel with 18 ct Sedna gold bezel ring, crown and pushers; a thick case, close to 17 mm, with a sapphire caseback; 21 mm lug width |
| Bezel | Brown ceramic with tachymeter scale |
| Movement | Calibre 9904, automatic, Co-Axial escapement, column-wheel chronograph, silicon balance spring, two barrels, 60 hours power reserve, resistant to magnetic fields of 15,000 gauss, Master Chronometer certified by METAS |
| Dial | Brown; 3 o'clock counter combines the 60-minute and 12-hour chronograph totalisers; 9 o'clock counter carries small seconds and a pointer date; moonphase at 6 with a photo-realistic moon disc |
| Crystal | Domed sapphire, anti-reflective both sides |
| Strap | Brown leather on a folding clasp; Omega also lists this case on a steel and Sedna gold bracelet under a different reference |
| Water resistance | 100 m (330 ft) |
| Launch | Moonphase Master Chronometer family introduced in 2016; this two-tone brown dial is one of the original configurations |
Sources: the Master Chronometer standard is administered by METAS, the Swiss Federal Institute of Metrology, and the chronometer test that precedes it by COSC. Omega publishes the reference details on its own site; confirm the reference on omegawatches.com and on the warranty card before buying.
What does the calibre 9904 do?
The 9904 is the moonphase and date version of Omega's 9900 column-wheel chronograph. It is Master Chronometer certified, which means the finished watch, not just the movement, passes METAS testing for accuracy between 0 and plus 5 seconds a day, resistance to 15,000 gauss, water resistance and power reserve. Two barrels give 60 hours of running time. The dial layout is unusual for a chronograph: the counter at 3 stacks the 12-hour and 60-minute hands on one axis so you read elapsed time like a small clock, while the counter at 9 carries the running seconds and a pointer hand for the date. The moonphase at 6 is the headline: a disc with two detailed moons showing the near side's surface, accurate enough that it needs a correction of one day roughly every ten years if the watch is kept running. Set it by the corrector in the case side; a pin is supplied.
304.23.44.52.13.001 vs 304.30.44.52.01.001 vs 329.53.44.51.03.001: which two-counter Speedmaster?
| 304.23.44.52.13.001 | 304.30.44.52.01.001 | 329.53.44.51.03.001 | |
|---|---|---|---|
| Case | 44.25 mm steel and Sedna gold, brown ceramic bezel, leather strap | 44.25 mm steel, black ceramic bezel, steel bracelet | 44.25 mm Sedna gold throughout, blue ceramic bezel, leather strap |
| Dial | Brown, moonphase and pointer date | Black, moonphase and pointer date | Blue, Racing minute track, date at 6, no moonphase |
| Movement | 9904, Master Chronometer, 60 h | 9904, Master Chronometer, 60 h | 9900, Master Chronometer, 60 h |
| Bizak catalogue ask, 17 Oct 2026 | US$15,385 | US$11,099 | US$29,399 |
| Who it suits | Wants the moonphase and some gold, wears it on leather | Wants the moonphase as a daily watch on a bracelet | Wants a solid gold Speedmaster and a sportier dial |
The all-steel Moonphase is the value route to the 9904 and the one to choose if a bracelet matters; the ceramic bezel and the complication are identical. The two-tone adds Sedna gold on the bezel ring, crown and pushers and a brown dial that suits the warmer metal, for a premium our catalogue put at a little over US$4,000 on 17 October 2026. The Racing in full Sedna gold is a different proposition: twice the ask, no moonphase, and a case that is gold through and through. Our Racing 329.53.44.51.03.001 guide covers that reference in detail.
How does a 44.25 mm Speedmaster Moonphase wear?
This is a large watch. The 44.25 mm diameter is softened by the Speedmaster's twisted lyre lugs, which pull the strap in under the case so the lug-to-lug is shorter than the diameter suggests, but the thickness is the number to try on for: the two barrels, column wheel and moonphase module stack to close to 17 mm, and the domed crystal adds to that. On a leather strap it sits lower and lighter than the bracelet version. Wrists above about 18 cm (7 inches) carry it comfortably; below that the 42 mm Moonwatch or the 38 mm Speedmaster are the better-proportioned choices. The brown dial and ceramic bezel are less reflective than they look in photographs, and the Sedna gold reads as a warm accent rather than a two-tone statement.
Sedna gold, ceramic and Liquidmetal: the materials on this reference
Sedna gold is Omega's 18 ct rose gold alloy, named after the dwarf planet and formulated with copper and palladium to hold its colour over time; it was introduced in 2013 and has been the house rose gold since. The bezel is brown zirconium-oxide ceramic, which does not fade or scratch in normal wear, with the tachymeter scale filled in a contrasting material so it does not wear away. On the two-tone Moonphase these finishes mean the watch should look the same in ten years as it does new, with the leather strap the only consumable; a replacement from Omega or a good aftermarket strap in 21 mm is straightforward.
How much is an Omega Speedmaster Moonphase two-tone? Price context in 2026
- Retail. Omega publishes the list price on its website and adjusts it periodically; the two-tone Moonphase sits above the steel versions and well below the full Sedna gold references. We have not quoted a figure because Omega's price changes would date it.
- Secondary market. Moonphase Master Chronometer references have generally been available pre-owned at a discount to retail in 2025 and 2026, with the steel versions the most common and the two-tone brown dial less often seen. Unlike the Moonwatch, they rarely carry a premium.
- Bizak catalogue asks. On October 17, 2026 our sourced catalogue listed the 304.23.44.52.13.001 at US$15,385, the all-steel bracelet 304.30.44.52.01.001 at US$11,099, the steel 304.33.44.52.01.001 on leather at US$10,699 and the full Sedna gold 304.63.44.52.01.001 at US$36,199, all sourced to order.
Those figures describe what we saw and will move. Ask for a dated quote for the exact reference, year and card; our Rolex vs Omega price and resale guide explains how Omega prices behave against Rolex.
Is the Speedmaster Moonphase a good investment?
No, and it is not sold as one. Omega's secondary values are strongest in the Moonwatch and in limited editions; a complicated Speedmaster on a leather strap is bought by people who want a moonphase from a brand that tests it to Master Chronometer standards, and who will accept a pre-owned discount if they sell. That is also the opportunity: buy the two-tone pre-owned with a full set and the discount is yours rather than the next buyer's. If resale ranks first in your decision, the steel Moonphase on a bracelet is the easier watch to move on.
Buying a Speedmaster Moonphase 304.23.44.52.13.001: what to check
- Warranty card and Omega's five-year warranty. Omega moved to a five-year warranty for new watches from July 2018; a card with a later date should still be inside it. The reference on the card must read 304.23.44.52.13.001 and the serial must match the caseback.
- Master Chronometer certificate. Each Master Chronometer watch comes with a certificate card; Omega also lets you look up the test results online by serial number. Ask for both.
- Chronograph function. Start, stop and reset from the pushers; the column wheel gives a light, consistent action and the counters at 3 should return to zero exactly.
- Moonphase and date correctors. Use the supplied pin to advance the moon and the pointer date; both should move in clean steps. A moon that has not been set is not a fault, but a corrector that does not respond is.
- Ceramic bezel. Check the edge for chips, the one damage ceramic suffers; the scale should be complete and unmarked.
- Sedna gold surfaces. Pushers, crown and bezel ring mark more easily than steel; light hairlines are normal on a worn example and deep nicks are not.
- Strap and clasp. Confirm the strap is Omega's with the clasp stamped, and that the clasp locks positively; aftermarket straps are fine but should be priced as such.
- Price against the band. A full-set two-tone Moonphase offered well below the steel version is the single most reliable warning sign.
Our authentication process describes what we inspect before dispatch.
Quick answers
How much is an Omega Speedmaster Moonphase 304.23.44.52.13.001?
Omega publishes the list price on its site and adjusts it periodically. Bizak's sourced catalogue listed the two-tone 304.23.44.52.13.001 at US$15,385 and the all-steel 304.30.44.52.01.001 at US$11,099, sourced to order, on October 17, 2026.
What movement is in the Speedmaster Moonphase 44.25 mm?
The automatic calibre 9904, a column-wheel Co-Axial chronograph with two barrels, 60 hours of power reserve and 15,000 gauss magnetic resistance, certified as a Master Chronometer by METAS.
Is the Speedmaster Moonphase too big?
At 44.25 mm and close to 17 mm thick it is a large watch, though the lyre lugs keep the lug-to-lug manageable. It suits wrists above about 18 cm; smaller wrists are better served by the 42 mm Moonwatch or the 38 mm Speedmaster.
How often does the moonphase need correcting?
Roughly once in ten years if the watch is kept running, because the 9904 uses a high-precision moon gear. If the watch stops, set the moon again with the corrector in the case side and the supplied pin.
What is the difference between the two-tone and the steel Moonphase?
The two-tone 304.23.44.52.13.001 has a Sedna gold bezel ring, crown and pushers, a brown ceramic bezel and a brown dial on leather; the steel 304.30.44.52.01.001 has a black bezel and dial on a bracelet. The calibre 9904 and the 44.25 mm case are the same.
Request a Speedmaster Moonphase 304.23.44.52.13.001 sourcing quote
Tell us whether you want brand new or pre-owned, the year range, whether the Master Chronometer card and full set are required, plus your budget and timing, through our sourcing enquiry form. We confirm the specific watch, photographs, card and final price before you commit. Catalogue entries: 304.23.44.52.13.001 steel and Sedna gold, brown dial, 304.30.44.52.01.001 steel on bracelet, 304.33.44.52.03.001 steel blue dial, 329.53.44.51.03.001 Racing in Sedna gold; browse the Speedmaster collection, the chronographs collection, or sell or trade your Speedmaster.
Related reading: Speedmaster Racing 329.53.44.51.03.001 Sedna gold guide · Speedmaster 38 Sedna gold guide · COSC, Superlative Chronometer and Master Chronometer explained · Rolex Daytona 126500LN guide.
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