Omega Seamaster Diver 300M Co-Axial Mens Watch
9 % 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
Omega Ref. O21032422003001 — Variants and collector names
Known as: SD300M Blue, Seamaster Blue 42mm, 300M Blue Rubber
Production phases and changes
- 2018: Market launch 210.32.42.20.03.001: Cal. 8800 (METAS-certified, anti-magnetic to 15,000 Gauss), 42mm case, blue ceramic dial, rubber strap
- 2023: Sister reference 210.32.42.20.03.002 'Summer Blue' 75th Anniversary introduced: PVD ceramic dial with color gradient, Grand Feu enamel bezel ring in Summer Blue, commemorative caseback (Poseidon/seahorse)
Movement variants
- 8800 (2018–today) · 25200 bph
Bezel variants
- SD300M-42-Keramik-Blau-WeißEmail-60min "Blue Ceramic White Enamel Diver"
Dial variants
- SD300M-42-Blau-Keramik-Wellen-Stahl-Date — SEAMASTER / 300M / polished triangle and baton indices rhodium-plated / date 6h / laser-engraved wave pattern on polished blue ceramic
Crystal variants
- Saphir-gewoelbt-AR-beidseitig-SD300M-42
Bracelet variants
- Kautschukband Blau Ref. SD300M-42-Rubber-Blau-2018
Reference 210.32.42.20.03.001 launched in 2018, replacing the 41mm predecessor generation built around the Cal. 2500C. Collectors know it as the SD300M Blue, Seamaster Blue 42mm, or simply the 300M Blue Rubber. New for this model was the 42mm case with a transparent sapphire caseback, paired with a blue ceramic wave-pattern dial on a rubber strap. Fourteen models launched simultaneously at introduction, with the .001 among them.
## Cal. 8800: METAS Certification and 15,000 Gauss
Inside sits the Cal. 8800, the first METAS Master Chronometer-certified movement in the series. Anti-magnetic to 15,000 gauss — no small feat in 2018. The bezel carries a white enamel ring on blue ceramic, catalogued in our system as SD300M-42-Ceramic-Blue-WhiteEnamel-60min.
## 2023: A Sister Arrives for the 75th Anniversary
Seventy-five years after the first Seamaster model of 1948, Omega followed up with the 210.32.42.20.03.002, sold alongside the .001. Known as the Summer Blue, it features a gradient PVD ceramic dial and a Grand Feu enamel bezel ring in place of the standard white. The lume on hands and indexes runs in light blue instead of white, and the caseback depicts Poseidon and a seahorse as a commemorative motif. Nothing about the .001's own spec sheet has changed since — it remains the founding reference from 2018.
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 Seamaster Diver 300M Co-Axial Mens Watch
Entry into Omega
At $6,456 this reference is one of the more affordable ways to wear a Omega on your wrist. That is precisely why many pieces have already passed through several hands — condition varies accordingly. Buyers here should pay particular attention to service history and honest photos from the seller.
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 Seamaster Diver 300M Co-Axial Mens Watch 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 Seamaster Diver 300M Co-Axial Mens Watch.
- 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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