Omega Seamaster 300
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 $6,801. 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. 234.30.41.21.03.002 — Variants and collector names
Known as: Summer Blue SM300, 75th Anniversary Heritage 300, Heritage 300 Summer Blue
Production phases and changes
- 2021: Generation change 233.30 → 234.30: Cal. 8400 (COSC) replaced by Cal. 8912 (METAS Master Chronometer). New proportions, slimmer case-flank-bezel assembly. Black .01.001 + Blue .03.001 as the initial models.
- 2023: Introduction of the 234.30.41.21.03.002 (Summer Blue) for the 75th Anniversary Seamaster collection. Ceramic bezel (Summer Blue enamel) instead of aluminum. Caseback with Poseidon anniversary emblem.
Movement variants
- 8912 (2023–today) · 25200 bph
Bezel variants
- SM300-2023-Keramik-SummerBlue-Email-60min "Summer Blue Ceramic 60-min"
Dial variants
- Summer Blue — Omega logo + 'Seamaster 300', sandwich construction, light blue gradient, 75th Anniversary Edition
Crystal variants
- Saphir-gewoelbt-AR-SM300-41
Bracelet variants
- Stahl-Armband verjüngend 21→16 mm (für 234.30.xx) Ref. SM300-2021-Stahl-21-16mm
The 233.30 ran from 2014 with the Cal. 8400, COSC-certified and solid, but without the Master Chronometer seal. 2021 brought the break: the 234.30 family replaced the caliber with the 8912, METAS-certified, with new case proportions and a slimmer lug-to-bezel relationship. Black .01.001 and Blue .03.001 were the first two dial variants of this new generation.
## 2023: Summer Blue Arrives for the 75th Anniversary
Reference 234.30.41.21.03.002 didn't follow until two years later, as part of the Seamaster's 75th-anniversary collection. Buyers know it by names like Summer Blue SM300 or Heritage 300 Summer Blue — officially it's simply 234.30.41.21.03.002. The same colorway landed at the same time on the 42mm Seamaster Diver 300M, reference 210.32.42.20.03.002.
## Ceramic Instead of Aluminum — And No Limited-Edition Trick
The most striking difference from the base 234.30 is at the bezel: ceramic in the Summer Blue enamel tone replaces the earlier aluminum insert, paired with a 60-minute scale. The sandwich dial carries the same shade of blue, and the caseback adds the Poseidon anniversary emblem. Despite the anniversary tie-in, the .03.002 isn't a limited edition with a fixed production number — it remains a standard catalog reference, which sets it apart from true limited special models and keeps it available to buyers long-term.
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 300
Entry into Omega
At $6,801 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 44.0 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 300 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 300.
- 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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