Omega · Seamaster Diver 300M
Strap for Seamaster Diver 300M Automatic 36.25 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 width
Recommended spring bar
Straps for the Seamaster Diver 300M 2153.80.00 (aka: 21538000)
Selected for the 20 mm lug width · workshop selection
Black Alligator Strap with Light Blue Edges€149
Red Alligator Strap Water Resistant€195
Green Rubberized Alligator Strap with Ecru Tribal Stitching€149
Military Alligator Green Strap€138
Hammered Calfskin Strap Light Blue€98
The Seamaster Diver 300M 2153.80.00 (aka: 21538000), seen from the bench
Frequently asked questions
What is the lug width of the Seamaster Diver 300M 2153.80.00?
The Seamaster Diver 300M 2153.80.00 has a lug width of 20mm, which is the distance between the case lugs. This is the exact measurement for finding compatible straps online without errors.
Which strap is most suitable for the Seamaster Diver 300M in yellow gold?
For a Seamaster Diver 300M in 18-carat yellow gold, alligator in medium-dark brown tone is the most elegant choice. Alternatively, French calfskin, shell cordovan, or vegetable-tanned leather straps create sophisticated pairings without competing with the warmth of the precious metal.
How do I measure the lug width of my Seamaster Diver?
Place the watch on a flat surface. Using a caliper or millimeter ruler, measure the horizontal distance between the two metal lugs (case lugs) where the strap attaches. For the 2153.80.00 the result must be exactly 20mm.
Is an aftermarket 20mm strap really compatible with the 2153.80.00?
Yes, any strap with a 20mm lug width is compatible with the Seamaster Diver 300M 2153.80.00. Compatibility depends only on lug width, not on brand. Always verify the lug width with the retailer before purchase.
How long does a leather strap typically last on a Seamaster Diver 300M?
A quality leather strap, regularly maintained and not continuously exposed to salt water or extreme humidity, typically lasts 3-5 years. Vegetable-tanned leather straps tend to have longer longevity as they develop a natural protective patina over time. Regular maintenance and rotating with other straps significantly extends durability.
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.
Request an appointment →Casati Milano · Via XX Settembre 15, Milan · by appointment only