Omega Speedmaster Professional Moonwatch Moonphase
27 % below RRP
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ℹ️ 1-month trend
Price change over the past 30 days. Shows the short-term market movement — relevant if you want to buy or sell soon.
ℹ️ 4-month trend
The central metric behind the momentum score. It filters out short-term swings and shows the true, medium-term market trend of this reference.
ℹ️ Volatility
Annualised price fluctuation. Below 10 % = very stable, 10–20 % = normal, above 20 % = volatile. With high volatility the price can change quickly — in both directions. Be cautious about buying without checking the current price.
ℹ️ Momentum score
ChronoCheck's own indicator from 0 to 100, calculated from the 4-month trend, volatility and market direction.
- Above 60 — Upward trend. Good time to sell, prices are rising.
- 40 – 60 — Neutral. Stable price level, no pressure to act.
- Below 40 — Downward trend. Wait or enter at a good price.
ℹ️ Investment Grade A/B/C/D
ChronoCheck's own rating for each reference. A 0–100 point scale, made up of four weighted components:
- Momentum (40 pts) — trend strength from the momentum score.
- Liquidity (25 pts) — number of active live listings.
- Stability (20 pts) — inverse volatility — the calmer, the better.
- Source robustness (15 pts) — number of independent market sources.
- A · 75+ Trend is right, liquidity good, data broad.
- B · 55–74 Solid, but one component weaker.
- C · 35–54 Average, volatility or market breadth weigh on it.
- D · below 35 Downward or too little data — a collector's piece.
Not investment advice. Pure data analysis from aggregated market sources.
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Technical data
Lift angle 52° — important for timing-machine diagnosis: with this value a watchmaker can correctly measure rate deviation, amplitude and beat error. ChronoCheck verifies such technical details directly from the manufacturers' factory specifications.
Omega Ref. 304.93.44.52.03.002 — Variants and collector names
Known as: Blue Side of the Moon, BSotM, BSotM Aventurine, Blue Aventurine Moonphase
Movement variants
- 9904 (2018–today) · 28800 bph
Bezel variants
- BSotM-Blau-Keramik-Tachy-Ceragold-44mm
Dial variants
- Blue Aventurine Moonphase — Omega crown + SPEEDMASTER at top; 3h: 30min counter; 9h: 12h counter + small seconds; 6h: moonphase (aventurine disc, Sedna Gold moons); date via separate hand (red tip)
Crystal variants
- Saphir-AR-beidseitig-DSotM-44mm
Bracelet variants
- Blaues Lederband mit Keramik/CeramiTi-Faltschließe Ref. BSotM-Blau-Leder-44mm-CeramiTi-Foldover
Search for 304.93.44.52.03.002 on a Rolex or auction forum and you'll rarely find it by reference number. Collectors call it the Blue Side of the Moon, or BSotM for short; when the stone-like dial comes up in conversation, it's BSotM Aventurine or Blue Aventurine Moonphase. Four names for the same watch — that's the rule rather than the exception with Omega's Speedmaster Moonphase line, and it's exactly why checking the reference before you buy is non-negotiable.
The dial carries the designation BSotM-Blue-Aventurine-Moonphase-SednaAppl. Aventurine isn't a painted effect — it's genuine glass with copper particles fused in, so every dial comes out looking slightly different. The indexes are set in Sedna Gold, Omega's proprietary rose gold alloy with a higher palladium content to resist fading.
## A Caliber Worth Scrutinizing
Beneath the dial sits Caliber 9904, a Co-Axial Master Chronometer with moonphase chronograph function. The bezel carries the designation BSotM-Blue-Ceramic-Tachy-Ceragold-44mm — ceramic, 44 millimeters across, with a tachymeter scale in Ceragold, Omega's patented gold-ceramic bond that won't chip the way a printed version would.
For authentication on this reference, three things matter most. First, the consistency of the aventurine texture under a loupe — genuine pieces show no repeating pattern. Second, the engraving on the Ceragold scale, which needs to sit sharp-edged and free of color bleed within the ceramic. Third, the rotor finish on the 9904 as seen through the display back, a detail that on fakes almost always comes out crude.
Brand profile: Omega
Omega is the second most counterfeited Swiss watch brand. The Speedmaster and Seamaster are especially targeted. Pay close attention to movement details (Co-Axial) and dial textures.
- Speedmaster: The chronograph reset hand must snap back precisely to 12 o'clock — fakes stop 1–3 seconds off or wobble
- Speedmaster (Hesalite): The Omega logo is micro-laser-etched on the UNDERSIDE of the Hesalite crystal — only visible at a specific angle and in the right light — fakes omit it or place it incorrectly
- Seamaster: The wave-pattern dial must be ENGRAVED (tactile relief) — printed/flat wave lines = fake
- DON (Dot Over Ninety): small dot ABOVE the '90' on the Speedmaster tachymeter bezel — position/size often wrong on fakes
Serial number format: Omega serial number: 8-digit number on the caseback or between the lugs (on older models). Since ~2018 engraved on the caseback at 6 o'clock. Format: purely numeric. Verifiable on the Omega website with an extract from the archive.
Further sources
Buying guide: Omega Speedmaster Professional Moonwatch Moonphase
Market situation and price range
At $14,019 the Speedmaster Professional Moonwatch Moonphase sits in a segment where first owners sell regularly — clean pieces with box and papers are not uncommon. The jump from "good" to "very good" usually costs 1,000 to 2,000 euros more at purchase. You get that premium back on resale if the condition is preserved.
What to look out for when buying?
- Authenticity: The serial number and reference on the case must match the papers. A professional authenticity check of the Omega Speedmaster Professional Moonwatch Moonphase reliably rules out counterfeits.
- Condition: Check scratches on the case and bezel — professional refurbishment can leave traces.
- Service history: A documented service by the manufacturer or a certified watchmaker increases the value.
- Scope of delivery: Box, papers and warranty card make a noticeable price difference on the Speedmaster Professional Moonwatch Moonphase.
- Independent certification: The CPS-52 standard covers 52 checkpoints — from the serial number and the timing machine to water resistance. The result is secured on the blockchain and can be verified at any time.
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