Omega · Seamaster Diver 300M

Strap for Seamaster Diver 300M Master Co-Axial 44 Chronograph Stainless Steel / Sedna Gold / Black / Rubber

Takes 21 mm straps. Verified lug width, the straps that fit this model, and answers to the most common questions.

Lug width21 mm
Case diameter44 mm
Reference210.22.44.51.01.001 (aka: 21022445101001)
FamilySeamaster Diver 300M
MovementOmega caliber 9900 Hours, Minutes, Small Seconds | Date | Chronograph, Column wheel | Chronometer, Co-Axial Escapement
CaseCeramic | Sedna Gold, Stainless Steel

Recommended spring bar

Omega Spring Bars 21mm — Single Diameter

Technical match for lug width and diameter · lug 21 mm · Ø 1.8 mm

All Omega spring barsOpen →

Straps for the Seamaster Diver 300M 210.22.44.51.01.001 (aka: 21022445101001)

Selected for the 21 mm lug width · workshop selection

All 21 mm straps →

The Seamaster Diver 300M 210.22.44.51.01.001 (aka: 21022445101001), seen from the bench

The Seamaster Diver 300M reference 210.22.44.51.01.001 combines a 44mm stainless steel and Sedna Gold case with the caliber 9900 Co-Axial Master Chronometer movement, offering 300 metres water resistance and 60-hour power reserve. This two-tone version features a blue ceramic bezel, transparent caseback, and screw-down crown. The lug width is 21mm, designed for tool watches of medium-large proportions.

Frequently asked questions

What is the lug width of the Omega Seamaster Diver 300M reference 210.22.44.51.01.001?

The lug width of the Seamaster Diver 300M 210.22.44.51.01.001 is 21 millimetres. This dimension is fixed on this model and is measured from the external distance between the two lugs protruding from the case. Always verify with a digital calliper before ordering a strap to ensure precise compatibility.

Which strap material is recommended for the Seamaster Diver 300M Sedna Gold/Steel?

For the 210.22.44.51.01.001 in two-tone Sedna Gold and steel, vegetable-tanned alligator with medium grain is ideal: it complements the warm tone of Omega gold and captures light like the ceramic bezel. Sophisticated alternatives include natural calf leather with elegant patina or shell cordovan for aesthetic durability. Vulcanised rubber remains the tactical choice for sports use and diving, without compromising the luxury positioning.

How do you change the strap on the Omega Seamaster Diver 300M 210.22.44.51.01.001?

Strap replacement requires a spring bar tool: insert the forked tip into the lateral gaps of the lugs on the case, apply light pressure and the pin will pop out. Remove the old strap and insert the new one by snapping the pins into their seats. For the 210.22.44.51.01.001 with 21mm lug width, ensure the strap has openings compatible with these standard Omega pins.

Can I use an aftermarket 21mm lug width strap on my Seamaster Diver 300M 210.22.44.51.01.001?

Yes, artisanal aftermarket straps with 21mm lug width are fully compatible with the 210.22.44.51.01.001. Simply verify that the holes are open to the correct width for Omega pins and that the quality of the leather or material is suitable for the luxury positioning of the watch. Milanostraps.it offers customisable 21mm straps with 18-month warranty and fast shipping.

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

A quality leather strap (alligator, calf or shell cordovan) used daily on a Seamaster Diver 300M typically lasts 3-5 years before requiring replacement, depending on use, water exposure and maintenance. Vegetable-tanned leather develops a visible but stable patina over time. Avoid prolonged immersion and salt water with natural leathers; if you use the watch for diving, alternate with a vulcanised rubber strap to extend the life of the leather.

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