Omega Seamaster Diver 300M Co-Axial 44mm Mens Watch Blac
10 % 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. O21062445101001 — Variants and collector names
Known as: SD300M Sedna Gold Chrono, Seamaster Diver Full Gold Chronograph
Movement variants
- 9901 (?–today) · 28800 bph
Bezel variants
- SD300M-44-Chrono-Keramik-Ceragold-Sedna
Dial variants
- SD300M-44-Chrono-Schwarz-Keramik-Wellen-Sedna — Ceramic, laser-etched wave pattern, applied hour indices (steel with Sedna Gold appliqués), date at 6h, subdial 12h counter at 3h, subdial small seconds at 9h, central chronograph hand (60s)
Crystal variants
- Saphir-AR-beidseitig-SD300M-44-Chrono
Bracelet variants
- Kautschuk schwarz mit Sedna-Gold-Taucherklappschloss Ref. SD300M-44-Chrono-Rubber-Black-Sedna
The O21062445101001, known in collector circles as the SD300M Sedna Gold Chrono or the Seamaster Diver Full Gold Chronograph, is Omega's answer to the question of what happens when a professional diving chronograph is executed in 18-karat Sedna gold without compromise. The 44mm case in Omega's proprietary alloy displays a warmer, more reddish color spectrum than classic yellow gold — and brings a hardness that comparable yellow gold references in this class simply cannot match. In the real-world watch market, the price premium over the stainless steel variant exceeds 30,000 euros.
## Ceramic and Ceragold: A Bezel Detail With Real Consequences
The Ceragold bezel only reveals itself on a second look. Omega presses Sedna gold elements directly into the ceramic carrier — the result stays scratch-resistant where classic gold bezels typically begin showing wear within two years. The black ceramic dial with its embossed wave pattern, referred to internally as "SD300M-44-Chrono-Schwarz-Keramik-Wellen-Sedna," serves as a quiet visual counterpoint to the warm Sedna tone of the indices and chronograph hands. This contrast reflects a deliberate design decision: the reference is meant to set itself apart from the purely gold dress chronographs offered by competitors.
## Calibre 9901 and What 15,000 Gauss Magnetic Resistance Means in Practice
The manufacture calibre 9901 runs on a Co-Axial escapement and is METAS-certified, with magnetic resistance up to 15,000 gauss. The integrated chronograph reads on the central hand's 60-second scale; power reserve stands at 60 hours. For a full-gold watch at 44mm, this is a clear positioning statement: Omega explicitly pitches the O21062445101001 as a tool watch, not a piece of boardroom jewelry.
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 Co-Axial 44mm Mens Watch Blac
What drives the price here
At $41,578 the watch sells well if the condition is right. A market rule of thumb: a complete set with box, papers and warranty card brings 10 to 15 percent more than the bare watch. Buying without papers can pay off, but you take the same discount again later when you resell.
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 Co-Axial 44mm Mens Watch Blac 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 Co-Axial 44mm Mens Watch Blac.
- 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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