Omega

Seamaster Diver 300M Chronograph 44mm, Sedna Gold

Name: Omega Seamaster Diver 300M Chronograph 44mm, Sedna Gold 210.62.44.51.01.001
Brand: Omega
SKU: 210.62.44.51.01.001

Ref. 210.62.44.51.01.001

2019–present · 44mm · caliber Omega Cal. 9901: Co-Axial Master Chronometer chronograph, 60h PR; column wheel, METAS-certified to 15,000 gauss, silicon balance spring, twin series barrels

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In-house manufacture caliber · caliber Omega Cal. 9901: Co-Axial Master Chronometer chronograph, 60h PR; column wheel, METAS-certified to 15,000 gauss, silicon balance spring, twin series barrels · 60h power reserve (2.5 days)

Large case: suits wrists 7 in+ (18 cm+)

44 mm case. 21 mm lug width. A bold, statement-size wear. Best suited to larger wrists where the case sits flush.

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Authentication

A Sedna gold chronograph, and the single most useful thing to know is that this reference IS a chronograph. It is routinely listed as a plain Seamaster Diver 300M, which is a different and much cheaper watch.

Known issues in the market

Omega's own model name for this reference is "Seamaster Diver 300M Co-Axial Master Chronometer Chronograph 44 mm". A listing describing a three-hand diver at this reference has the wrong watch or the wrong number.
Sedna gold is Omega's own red-gold alloy and is not the same as a plated case. Wear through to a different colour underneath is decisive.
The dial is black ceramic with the waves in positive relief, and the subdial rings and hands are Sedna gold rather than plated brass.

Area	What to check	What is correct	Red flag
dial	Chronograph registers present	Two subdial registers plus small seconds, with Sedna gold rings	A three-hand dial, which is a different reference entirely
dial	Laser-engraved waves in relief	Waves standing proud of a polished ceramic surface, catching light separately	A printed wave pattern flush with the dial
movement	Cal. 9901 and Master Chronometer papers	Column-wheel chronograph with a 60-hour reserve; METAS certificate matching the watch	A missing certificate on a watch sold as full-set, or a reserve well short of 60 hours
case	Sedna gold colour continuity	Even alloy colour at wear points, lugs and bracelet interfaces	Any colour change at an edge, which indicates plating

Common legitimate replacements

Rubber straps are consumable and replaced routinely.
Ceramic bezel inserts are replaced after damage; ceramic chips rather than scratches.

Expert resources: An Omega boutique can confirm the reference and re-issue Master Chronometer data. The steel Diver 300M entries in this catalog cover the shared case and crown tells.