Omega Seamaster 300M 36mm Ref 2551.80 1986 Watch

Q: What is the Omega Seamaster 300M Ref. 2551.80 (36mm)?
A: It’s the mid‑size version of Omega’s iconic Seamaster Professional 300M, featuring a 36mm stainless‑steel case and bracelet, a blue wave dial with date at 3 o’clock, and a blue unidirectional diving bezel. This example is automatic and chronometer‑rated, delivering classic dive‑watch functionality with elegant everyday wearability.

Q: Which movement does it use and what is the power reserve?
A: The 36mm automatic Seamaster 300M Ref. 2551.80 is typically fitted with the Omega Calibre 1120 (COSC‑certified), based on the ETA 2892‑A2. It offers a quickset date and a power reserve of around 44 hours. Exact calibre for this specific watch can be confirmed on request.

Q: Is it water‑resistant and can I swim or dive with it?
A: When new, the Seamaster Professional 300M was rated to 300 metres. For vintage/pre‑owned pieces, water resistance cannot be guaranteed without recent servicing and pressure testing. We recommend avoiding swimming or showering unless the gaskets have been replaced and the watch has been professionally tested. Always keep the crown fully screwed down and the helium valve closed before any exposure to moisture.

Q: What is the helium escape valve and do I need it?
A: The helium escape valve (at approximately 10 o’clock) is designed for saturation diving, allowing trapped gases to exit during decompression. It’s not required for regular swimming or day‑to‑day use—simply keep it fully closed.

Q: How do I set the time and date and wind the watch?
A: Unscrew the crown anti‑clockwise. Position 1: manual wind (about 20–40 turns if the watch has stopped). Position 2: quickset the date. Position 3: set the time. Avoid changing the date between roughly 8pm and 2am. When finished, push the crown in and screw it down firmly to help maintain water resistance.

Q: What crystal and bezel materials does it have?
A: The Seamaster 300M is fitted with a scratch‑resistant sapphire crystal. The blue bezel typically features an aluminium insert. Aluminium bezels can show light wear or colour fade over time; avoid harsh chemicals and abrasive cleaners and rinse with fresh water after sea exposure, then dry with a soft microfibre cloth.

Q: Will it fit my wrist, and can the bracelet be resized?
A: This watch fits wrists up to approximately 18.5 cm as listed. The stainless‑steel bracelet can be sized via removable links and includes a diver’s extension. Additional links may be sourced subject to availability; share your wrist measurement and we’ll size it before dispatch.

Q: Can I swap the bracelet for a strap, and what is the lug width?
A: Many 36mm Seamaster 300M models use an 18mm lug width; we can confirm the exact width for this piece on request. Quality rubber, leather or NATO straps are popular alternatives—ensure the strap matches the correct lug width and use appropriate spring bars for secure fitment.

Q: Is this the same style as the “Bond Seamaster”?
A: Yes—this mid‑size 2551.80 shares the signature blue wave dial and bezel design of the famous Bond‑era Seamaster. The on‑screen model was the larger 41mm 2531.80, but the overall aesthetic and features are closely related.

Q: What accuracy and service interval should I expect?
A: As a chronometer‑rated automatic, a healthy example should keep excellent time, though performance varies with age and service history. A routine service every 5–10 years is generally recommended, or sooner if accuracy or water resistance is a priority. Keep the watch away from strong magnets and have seals checked if you plan any moisture exposure.

Q: What is included, and what warranty/shipping do you offer?
A: This listing is delivered with its box as stated. A Retro Tale rigorously authenticates every item and guarantees 100% originality. All watches include a 12‑month mechanical guarantee. We offer free, fully insured DHL shipping, a 14‑day return policy, and 0% customs fees for EU buyers; contact us for any specific delivery or warranty questions.