Omega · Seamaster Diver 300M

Strap for Seamaster Diver 300M Automatic 41 GMT Yellow Gold / Blue / Bracelet

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

Lug width20 mm
Case diameter41 mm
Reference2134.80.00 (aka: 21348000)
FamilySeamaster Diver 300M
MovementOmega caliber 1128 hours, minutes, seconds, Additional 24 hours Hand (adjustable) | date | chronometer
CaseYellow Gold

Recommended spring bar

Spring bars Omega 20mm — 1.8mm diameter

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

All Omega spring barsOpen →

Straps for the Seamaster Diver 300M 2134.80.00 (aka: 21348000)

Selected for the 20 mm lug width · workshop selection

All 20 mm straps →

The Seamaster Diver 300M 2134.80.00 (aka: 21348000), seen from the bench

The Omega Seamaster Diver 300M reference 2134.80.00 features a 41mm yellow gold case with a deep blue dial and unidirectional ceramic bezel. Powered by the Omega caliber 1128 automatic movement, it offers hours, minutes, seconds, GMT function, date, and COSC chronometer certification. The 20mm lug width ensures proper proportions between case and wrist, while the sapphire crystal with AR coating provides excellent readability underwater and in low light conditions.

Frequently asked questions

What is the lug width of the Omega Seamaster Diver 300M 2134.80.00?

The Omega Seamaster Diver 300M 2134.80.00 uses a lug width of 20 millimeters. This measurement is specific to the model and represents the internal distance between the metal pins of the case lugs. To ensure perfect compatibility with your strap, always verify that the lug width is exactly 20mm before purchase.

What is the best strap for the Omega Seamaster Diver 300M in yellow gold?

For the 2134.80.00 in yellow gold, we recommend a vegetable-tanned alligator strap (1.2-1.4mm) that creates extraordinary aesthetic contrast with the gold, or a shell cordovan for formal settings. If you wish to maintain sports versatility, a Tropic rubber strap or natural rubber with tactile grip ensures underwater reliability. The choice depends on intended use: noble leather for everyday elegance, rubber for water activities.

How do you change the strap on the Omega Seamaster Diver 300M 2134.80.00?

Remove the two metal pins from the case lugs using a spring bar tool. Gently insert the tool under the pin, apply downward pressure (not lateral) and slide the pin out of the hole. Once the old strap is removed, align the pins of the new strap to the lug slots and push the pin into position until you feel a slight click. Verify that the pin is fully inserted before wearing the watch.

Can I use an aftermarket strap on an Omega Seamaster Diver 300M 2134.80.00?

Yes, provided the strap has been made with a compatible 20mm lug width. Many artisanal straps are custom-made with adjustable lugs, allowing you to personalize color, material, and finishes. Always verify with the maker that the lug width is 20mm and that the lugs have been correctly measured before delivery.

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

A noble leather strap (alligator, cordovan, vegetable-tanned calf) has an average lifespan of 3-5 years if worn daily, as leather is naturally subject to wear from friction, UV exposure, and humidity. The lifespan extends to 7-10 years if worn 2-3 times weekly. Rubber or Tropic straps last 4-6 years. Keep the strap dry after immersion and treat it occasionally with specific conditioner to extend its life.

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