Omega Seamaster Diver 300 M
27 % below RRP
📱 Track this reference's market value on the go with the watch value app — daily median, price alerts and a watchlist.
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.
The current market value of the Omega Seamaster Diver 300 M (Ref. 210.30.42.20.06.001) is $5,541. The trend points up (plus 10.4% over four months).
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 $5,426. 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. 210.30.42.20.06.001 — Variants and collector names
Known as: Grey Wave SD300M, Brushed Grey Seamaster
Production phases and changes
- 2024: Introduction of the NoDate parallel line (Nov. 2024), standalone refs — does not directly affect 210.30.42.20.06.001 (Date)
Movement variants
- 8800 (2021–today) · 25200 bph
Bezel variants
- SD300M-42-Keramik-Blau-WeißEmail-60min "Blue Ceramic White Enamel Diver"
Dial variants
- Grey Wave — SEAMASTER (white) / DIVER 300M (white) / Co‑Axial Master Chronometer / Omega logo applied; brushed PVD-chrome ceramic dial with laser-engraved waves; applied indices filled white SLN; date 6h
Crystal variants
- Saphir-gewoelbt-AR-beidseitig-SD300M-42
Bracelet variants
- 3-Link Stahl gebürstet/poliert mit Comfort-Extension Ref. SD300M-42-3Link-Steel-FoldoverDiver-2020
- Schwarzes Kautschukband mit Faltschließe (Ref. .06.002) Ref. SD300M-42-Rubber-Black-FoldoverDiver-2020
The reference 210.30.42.20.06.001 is Omega's Seamaster Diver 300M in steel, 42 mm, and carries two nicknames in the community: Grey Wave SD300M and Brushed Grey Seamaster. Both refer to the SD300M-42-Grey-PVD-Ceramic-Wave-Steel-Date dial, a brushed grey finish with the signature wave pattern Omega has run across several dial variants since the 300M relaunch in 2018. That pattern alone sets the reference apart from the standard black version at a glance, even from two metres away on the wrist.
## Blue ceramic instead of aluminum — and why that mattered in 2024
The bezel runs under the code SD300M-42-Keramik-Blau-WeißEmail-60min: blue ceramic with a white enamel scale and a 60-minute track. That becomes interesting set against November 2024, when Omega introduced a standalone NoDate parallel line. The new no-date versions in black and grey deliberately got an aluminum bezel instead of ceramic, a clear step down in the material hierarchy meant to keep price positioning clean. The 210.30.42.20.06.001 with date was completely untouched by that shift and continues to run with its ceramic bezel unchanged.
## Caliber 8800: the movement that's barely changed since 2018
The reference is powered by the Caliber 8800, Omega's Co-Axial Master Chronometer base movement for the 42 mm line. For market valuation, that means anyone bringing a Grey Wave with box and papers to a sale or purchase should check specifically for the combination of wave dial and blue ceramic bezel. That exact pairing is what separates the 210.30.42.20.06.001 from the cheaper NoDate siblings that have sat alongside it in the lineup since late 2024.
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 300 M
Entry into Omega
At $5,541 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.
Where the price stands
The price of the Seamaster Diver 300 M has risen by +10.4% over the past four months. Anyone selling now hits a good window. If you want to buy: no need to wait — the market is currently more hot than cold, and a clear end to the trend is not in sight.
Watch out for swings: This reference has an above-average volatility of 70.4 percent. In concrete terms: the price can move by several hundred euros within a few weeks. Check the current value before buying or selling — old listings or auction results from two months ago are of little help.
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 300 M 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 300 M.
- 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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