Omega Seamaster Diver 300M
28 % 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.
What if you had bought back then …
What would a purchase at the median market price back then have become — at today's level of $7,666. A pure return calculation, excluding insurance, servicing and transaction costs.
Data from an aggregated median time series (watch_market_daily). CAGR = Compound Annual Growth Rate, normalized to 365 days. Not an investment recommendation.
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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. 210.22.42.20.01.002 — Variants and collector names
Known as: Sedna Black, Two-Tone SD300M, Bicolor Diver Black
Movement variants
- 8800 (2018–today) · 25200 bph
Bezel variants
- SD300M-42-Keramik-Schwarz-Ceragold-60min "Black Ceramic Ceragold Bezel"
Dial variants
- Wave Dial Black Ceramic Sedna Date — Polished black ceramic / Laser-engraved wave pattern / Applied Sedna Gold indices white SLN / Date 6 o'clock / Skeleton hands Sedna Gold / 'SEAMASTER / DIVER 300M / Co-Axial / MASTER CHRONOMETER' in white
Crystal variants
- Saphir-gewoelbt-AR-beidseitig-SD300M-42
Bracelet variants
- Kautschuk-Band Schwarz (Ref. 210.30.42.20.01.010) Ref. SD300M-42-Rubber-Schwarz-2018
The 210.22.42.20.01.002 is the Sedna variant in the SD300M lineup that makes the boldest departure from the classic steel-and-blue. The 42mm case pairs steel with Omega's proprietary Sedna Gold — an 18-karat alloy introduced by the company in 2012 and kept exclusively in-house ever since. No outside gold alloy, no standard rose gold: Sedna has its own distinct hue, warmer than yellow gold and engineered for long-term fade resistance. Among collectors the watch goes by "Sedna Black" or "Two-Tone SD300M" — both names describe the same ref, neither is official.
## The Dial That Defines the Watch's Character
The wave dial sits as a black ceramic element within the case, carrying the signature wave-pattern lines Omega has associated with the Seamaster since the 1990s. On this reference, the indices are in Sedna Gold, and the date sits at three o'clock — a detail collectors classify as the "Date" variant and factor into secondary-market pricing accordingly. The Ceragold bezel follows the same logic: the 60-minute scale is laser-ablated into black ceramic and then filled with gold, making the markings more durable than any painted equivalent.
## Calibre 8800 as the Real Case for Buying
The Co-Axial Calibre 8800 runs Master Chronometer-certified to METAS standards, meaning 15,000 gauss of magnetic resistance and a rate accuracy of 0 to +5 seconds per day. Power reserve stands at 55 hours. New retail sits between $10,859 and $12,344 depending on the market — a solid foundation for a sport watch in this segment. Whether the two-tone aesthetic holds up over the long haul is a matter of taste; the movement is not.
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
Entry into Omega
At $7,666 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 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.
- 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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