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Omega · Seamaster Diver 300M

Strap for Seamaster Diver 300M Co-Axial 41 Stainless Steel / Black / Bracelet / SASR

Takes 20 mm straps. Verified lug width, the straps that fit this model, and answers to the most common questions.

Lug width

20mm
20 mm strapsAll Omega
Lug width20 mm
Case diameter41 mm
Reference212.30.41.20.01.004
FamilySeamaster Diver 300M
MovementOmega caliber 2500 Hours, Minutes, Seconds | Date | Co-Axial Escapement, Chronometer
CaseStainless Steel

Recommended spring bar

Spring bars Omega 20mm — 1.8mm diameter

Technical match for lug width and diameter · lug 20 mm · Ø 1.8 mm

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Straps for the Seamaster Diver 300M 212.30.41.20.01.004

Selected for the 20 mm lug width · workshop selection

All 20 mm straps →

The Seamaster Diver 300M 212.30.41.20.01.004, seen from the bench

The Seamaster Diver 300M model 212.30.41.20.01.004 is a professional diving watch with a 41mm stainless steel case and Co-Axial movement, featuring Omega's caliber 2500 automatic mechanism with silicon hairspring and COSC chronometer certification. The 20mm lug width accommodates a variety of strap options while maintaining proper lateral fit and deployant alignment. The blue wave dial, satin and polished steel surfaces, and sapphire crystal with anti-reflective coating are engineered for 300-meter water resistance.

Frequently asked questions

What is the exact lug width of the Omega Seamaster Diver 300M 212.30.41.20.01.004?

The lug width is 20mm, measured perpendicular between the two shoulders of the case. This standard allows you to pair any bespoke strap designed for 20mm lugs without compromise in fit or deployant clasp alignment.

What is the best strap material for the Seamaster Diver 300M?

For the Seamaster Diver 300M we recommend blue alligator (which echoes the wave dial), vegetable-tanned calf for an aging patina, or black shell cordovan for structural rigidity and extreme durability. Anthracite-grey NATO is ideal if the diver is destined for recurring immersion or use in humid climates.

How do you change the strap on a Seamaster Diver 300M 212.30.41.20.01.004?

The strap is removed using a spring bar tool, inserting the flat tip into the lateral opening of the spring pin. Press gently to release the spring, extract the pin, then remove the old strap. Reverse the procedure for the new strap, ensuring the lug is perfectly horizontal.

Can I use an aftermarket strap with 20mm lug width on this model?

Yes, any bespoke strap with 20mm lug width is compatible with the 212.30.41.20.01.004. Milanostraps offers a range of <a href="https://milanostraps.it/collections/cinturini-orologi-per-misura-ansa-20mm">20mm straps</a> in alligator, calf, shell cordovan and rubber, customizable according to technical specifications (length, stitching thread, buckle).

How long does a leather strap last on the Seamaster Diver 300M?

A bespoke strap in fine leather lasts 3-5 years in daily use, with variance based on material and use conditions. Premium shell cordovan and alligator develop patina but maintain structure; vegetable-tanned calf progressively softens. Atelier Casati Milano offers 18-month warranty and support for maintenance and refinishing replacement.

The next step

The right strap isn't chosen. It is built, together.

From the atelier appointment to delivery, every step is made for those who know that things done well take time. Rare leathers, one piece at a time, eighteen months of warranty.

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Casati Milano · Via XX Settembre 15, Milan · by appointment only