Short answer
A "replica Seamaster 300M 291" is a seller listing tag, not an Omega model number. Omega's genuine references for the Seamaster Diver 300M sit in the 210.30.xx and 210.32.xx families. A number like 291 is a factory or batch code used by replica sellers to mark a production run. It tells you which batch the watch came from, not which genuine reference it copies. Two replicas built from the same Omega reference can differ in bezel action, dial texture, crown threading, and movement, so the batch code is a comparison tool, not a quality guarantee.
What a batch code does and does not cover
Batch codes exist because replica production is not standardized. A seller who lists 291 is signaling that this unit came from one run with one set of parts. That run may use a ceramic bezel insert, a sapphire crystal with anti-reflective coating on both faces, and a clone automatic movement, or it may use a mineral crystal and a cheaper movement with the same exterior. The code alone will not tell you which. Ask the seller to confirm what the code means for that specific listing before you compare it to any other number.
How to vet a Seamaster 300M replica
- Ask which Omega reference the case, dial, and bracelet are meant to match, then pull that reference from Omega's own site and note the case diameter, lug width, and thickness.
- Request the movement type by name, including whether it is a clone of an Omega caliber or a generic automatic, and ask for the beat rate.
- Confirm the crystal material and coating, since sapphire with double-sided anti-reflective coating is a common dividing line between tiers.
- Get the water resistance claim in writing and treat it as a marketing number unless the seller cites a test standard. ISO 6425 sets the requirements for genuine dive watches, and replica claims rarely carry that level of testing.
- Ask for the bracelet construction details: solid versus folded end links, screw versus pin sizing, and clasp type.
- Compare lume color and pip placement against official product photos, since these are the details batch runs change most.
QC photo checklist before shipping
- Dial shot straight on, so you can check date window alignment and index placement.
- Bezel shot at 12, checking that the pip lines up with the crown logo when the triangle is centered.
- Caseback shot to verify engraving depth and the presence of a serial line.
- Timegrapher readout if the seller offers one, covering rate, amplitude, and beat error.
- Crown-on-wrist shot to confirm the crown seats flush and does not overhang the case.
Red flags
- Stock photos instead of photos of the actual unit.
- No mention of movement type at any point in the listing.
- A batch code presented as a certification or as an official Omega number.
- Claims of 300 meters of water resistance on a watch with a push-pull crown and no gasket documentation.
- Payment methods with no dispute process.
Expectations and care
A replica Seamaster 300M is a cosmetic build. Treat it as such. Keep it away from salt water and hot showers unless a watchmaker has pressure tested it and replaced the case gaskets, and budget for a service or a movement swap if you plan to wear it daily. Prices track the batch: units with a clone movement, sapphire crystal, and ceramic bezel sit at the top of the replica range, while entry units cut corners where you cannot see them from three feet away. Decide which of those two you actually want before you pay. Note also that selling or importing counterfeit goods carries legal risk in the United States, where the Federal Trade Commission treats counterfeit sales and misleading product claims as deceptive practices.