Omega Seamaster Pro-Diver 300M 42mm Mens Watch Grey
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. O21032422006001 — Variants and collector names
Known as: Grey Wave, Chrome Dial, Grey Seamaster 300M, Wave Dial Grey
Production phases and changes
- 2018: Complete relaunch of the SD300M (Gen 4): case 41→42mm, date at 3→6 o'clock, fully ceramic bezel, Cal. 8800 Master Chronometer, transparent sapphire caseback, METAS certification up to 15,000 Gauss
Movement variants
- 8800 (2018–today) · 25200 bph
Bezel variants
- SD300M-42-Keramik-Blau-WeißEmail-60min "Blue Ceramic White Enamel Diver"
Dial variants
- Chrome Dial — OMEGA appliqué top / SEAMASTER / Co-Axial Master Chronometer / Diver 300M / date 6h / laser-engraved wave pattern horizontal / blue skeleton hands with white SLN
Crystal variants
- Saphir-gewoelbt-AR-beidseitig-SD300M-42
Bracelet variants
- Blauer Kautschuk-Strap mit Tang-Schließe Ref. SD300M-42-Rubber-Blau-Tang-2018
Reference 210.30.42.20.06.001 belongs to the fourth generation of the Seamaster Diver 300M, which Omega completely reimagined in 2018. The case grew from 41 to 42mm, the date window moved from 3 o'clock to 6 o'clock, and the Caliber 8800 brought in a Master Chronometer movement certified to 15,000 gauss. Grey was there from day one, shown alongside black and blue as Omega unveiled all three colors at the fair together.
## Why collectors call it the "Chrome Dial"
Collectors actually use four different names for this model: Grey Wave, Chrome Dial, Grey Seamaster 300M, and Wave Dial Grey. The dial carries the internal designation SD300M-42-Grey-Ceramic-PVD-Wave-Date and features the signature wave pattern Omega has used on this line since the 1990s, here rendered in matte grey with a PVD coating. The full-ceramic bezel in blue with its white enamel scale runs internally as SD300M-42-Keramik-Blau-WeißEmail-60min, and it's what delivers the contrast that makes this model instantly recognizable in photos.
## A case back you can see through
Unlike earlier Seamaster generations, the 210.30.42.20.06.001 shows off its Caliber 8800 through a transparent sapphire case back. This is exactly where anyone checking the watch should start. On poorly executed fakes, the finishing on the bridges is usually the first thing to give it away, along with the serial number stamped on the case back rim. The combination of a 42mm case, date at 6 o'clock, and grey wave dial didn't exist at Omega in this form before 2018, which narrows the reference down cleanly for authentication purposes.
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 Pro-Diver 300M 42mm Mens Watch Grey
Entry into Omega
At $6,453 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 Pro-Diver 300M 42mm Mens Watch Grey 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 Pro-Diver 300M 42mm Mens Watch Grey.
- 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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