Omega Seamaster Diver 300 M
7 % 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 $4,662. 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. 212.30.41.20.03.001 — Variants and collector names
Known as: SMPc, Ceramic Blue Seamaster, Smooth Blue 300M, Pre-2018 SMP 300M
Production phases and changes
- 2007: Introduction of the 212.30 reference series: ceramic bezel replaces aluminum bezel
- 2011: Switch from lacquered to smooth ceramic dial
- 2013: Caliber upgrade from Cal. 2500C to Cal. 2500D
- 2018: Discontinuation of the 41mm generation, replaced by the 42mm generation with Cal. 8800 Master Chronometer (Ref. 210.30.42.20.03.001)
Movement variants
- 2500C (2007–2013) · 25200 bph
- 2500D (?–today) · 25200 bph
Bezel variants
- SD300M-41-Blau-Keramik-60min
Dial variants
- Smooth Blue Ceramic — SEAMASTER / DIVER 300M / Co-Axial CHRONOMETER / date at 3h
- Lacquer Blue — SEAMASTER / DIVER 300M / Co-Axial CHRONOMETER / date at 3h
Crystal variants
- Saphir-AR-SD300M-41
Bracelet variants
- 3-Link Stahl poliert/gebürstet Ref. SD300M-41-3Link-Stahl-FoldoverDiver
Reference 212.30.41.20.03.001 is the blue Seamaster Diver 300M that collectors know by names like SMPc, Ceramic Blue Seamaster, or Smooth Blue 300M — the last 41mm generation before the major wave-pattern redesign of 2018. In 2007, Omega overhauled the entire 212.30 line: the aluminum bezel of earlier models gave way to ceramic, matched on the blue dial variant with a blue 60-minute scale. At the same time, Omega introduced a new reference-numbering system that the 212.30 still carries today.
## Four Years Later, the Dial Catches Up
Through 2011, the blue model shipped with a lacquered dial, code SD300M-41-Blau-Lackiert-2007 — a visual mismatch next to the glossy ceramic bezel beside it. From 2011 onward, a smooth ceramic dial known as Smooth Blue Ceramic replaced the lacquered version. From that change on, bezel and dial finally looked cut from the same cloth.
## 2013: New Heart, Same Case
Under the hood, 2013 brought a switch from caliber 2500C to caliber 2500D. The difference lies in the three-tier co-axial escapement, built closer in design to the larger caliber 8500. Frequency stayed at 3.5 Hz, 25,200 vibrations per hour — externally, only a changed date-font gives away the swap beneath the dial.
## Phased Out in 2018 — A Successor in a Different Size
At Baselworld 2018, Omega unveiled the 42mm successor generation, reference 210.30.42.20.03.001, with a laser-etched wave pattern and METAS certification as a Master Chronometer. The 41mm 212.30 continued on remaining stock until around 2019, with occasional stragglers turning up as late as 2021 — after that, the pre-2018 SMP 300M in this form was history for good, settling into its own clearly defined collector generation.
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 $4,662 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.
Watch out for swings: This reference has an above-average volatility of 106.7 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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