The authenticity of the watch has been checked and certified by Sebastian, who is one of Sweden's leading watch experts.

Q: What is the Omega Seamaster Diver 300M 42mm (ref. 210.22.42.20.01.001)?
A: It’s a modern, Swiss‑made diver’s watch with a 42mm stainless‑steel and 18k yellow‑gold case, black ceramic bezel with a diving scale, and a black ceramic wave‑pattern dial. It’s powered by Omega’s automatic Master Chronometer Co‑Axial movement and comes on a black rubber strap with pin buckle. This 2019 example is a full set with box, outer box, certificate and an extra strap, in very good pre‑owned condition.

Q: Which movement does it use and what performance can I expect?
A: It houses the Omega Co‑Axial Master Chronometer Calibre 8800 with a ~55‑hour power reserve. It’s METAS‑certified for precision, magnetic resistance (up to 15,000 gauss), and overall performance. It features hacking seconds for precise setting and a quickset date at 6 o’clock.

Q: Is it water‑resistant and suitable for swimming or diving?
A: The Diver 300M is rated to 300 metres when new. As this is a pre‑owned watch, water resistance cannot be guaranteed without recent gasket checks and pressure testing. If you plan to swim or dive, we recommend a fresh pressure test and ensuring the crown is fully screwed down and the helium valve is closed. Avoid hot showers/saunas and harsh chemicals, which can degrade seals.

Q: How do I use the bezel, crown, date and helium escape valve?
A: The ceramic bezel is unidirectional—rotate anti‑clockwise to time dives or intervals. Unscrew the crown to wind (Position 1), pull one click to set the date (Position 2), and two clicks to set the time (Position 3). Avoid changing the date between roughly 8pm and 2am. The helium escape valve at 10 o’clock is intended for saturation diving; keep it closed for normal use and never operate it underwater during recreational swimming.

Q: What are the bezel and dial made from, and how durable are they?
A: The bezel is black ceramic with a gold diving scale (often executed via Omega’s Ceragold process), offering excellent scratch resistance. The dial is ceramic with laser‑engraved waves and filled with Super‑LumiNova for low‑light legibility. Ceramic resists scratches very well but can chip if struck; metal surfaces and gold elements can show normal wear over time.

Q: Will it fit my wrist, and can the strap be adjusted?
A: This watch fits wrists up to approximately 20 cm as listed. The rubber strap features multiple sizing holes and a pin buckle for fine adjustment. If you’re unsure about fit, share your wrist measurement and we’ll advise on sizing or alternative strap options.

Q: Can I swap the rubber strap for a bracelet or other straps? What is the lug width?
A: Yes—this 42mm Diver 300M uses a 20mm lug width. It accepts compatible Omega straps and bracelets designed for the 42mm Seamaster Diver 300M case. For a two‑tone look that matches the case, use OEM steel/18k yellow‑gold components. This listing also includes an extra strap (see Accessories). We recommend a professional strap change to avoid scratching the lugs.

Q: How should I care for it, and how often should it be serviced?
A: Rinse with fresh water after seawater use, wipe with a soft microfibre cloth, and keep the crown fully screwed down. Despite its antimagnetic properties, avoid unnecessary exposure to strong magnetic fields. A routine service every 5–8 years is sensible, or sooner if accuracy or water resistance is a concern. If used regularly in water, have the seals pressure‑tested periodically.

Q: What is included and what is the condition?
A: This 2019 full set includes the original box, outer box, certificate and an extra strap. Condition is very good with light traces of use and some scratches on the case and case back as noted; please refer to the photos for details.

Q: Is it authentic, and what warranty/shipping do you offer?
A: A Retro Tale rigorously authenticates every item and guarantees 100% originality. All watches include a 12‑month movement 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.