Omega · Seamaster Diver 300M
Strap for Omega Seamaster Diver 300M 210.30.42.20.01.002
The Seamaster Diver 300M Nekton Edition / 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 210.30.42.20.01.002
Selected for the 20 mm lug width · workshop selection
Blue Alligator and Rubber Hybrid Strap · rubber, for the water€138
Green Rubberized Alligator Strap with Ecru Tribal Stitching · rubber, for the water€149
Black Alligator Strap with Light Blue Edges€149
Red Alligator Strap Water Resistant€195
Military Alligator Green Strap★ 5 · 1€138
Hammered Calfskin Strap Light Blue€98
What I'm asked about the Omega Seamaster Diver 300M 210.30.42.20.01.002
What strap size does the Omega Seamaster Diver 300M 210.30.42.20.01.002 take?
The Omega Seamaster Diver 300M 210.30.42.20.01.002 needs 20 mm between the lugs, usually 16 mm at the buckle. It's the size I've been fitting on it for years.
Can the strap on the Omega Seamaster Diver 300M 210.30.42.20.01.002 be changed?
Yes. It has spring bars between the lugs: with the right tool the strap comes off in a minute. If you'd rather not risk a scratch, I do it in the workshop.
Can I put a leather strap on the Omega Seamaster Diver 300M 210.30.42.20.01.002?
Yes, in 20 mm leather, as long as you don't wear it in the water: leather doesn't like the sea or the pool. For days in the water, rubber. On a 42 mm diver I go for a full-thickness strap, not a thin one.
Which strap do you recommend for the Omega Seamaster Diver 300M 210.30.42.20.01.002?
Rubber if you wear it in the water; otherwise a 20 mm calf strap, full thickness. You'll find it ready in the 20 mm collection. If you'd rather have something built on your wrist, the Casati atelier.
The Seamaster Diver 300M 210.30.42.20.01.002, seen from the bench
Frequently asked questions
What is the best strap for this Seamaster with a titanium case?
For grade 5 titanium, we recommend grey alligator, vegetable-tanned calf in cool tones (blue, cream-ivory), or hammered rubber for underwater use. A grey alligator strap pairs perfectly with the Hi-Tech ceramic bezel; natural calf develops a patina compatible with the titanium's aging process.
Is a 20mm aftermarket strap really compatible with the 210.30.42.20.01.002?
Yes, if the lug width is certified at 20mm and the construction quality is professional. Verify that the strap has precise tolerances (±0.1mm) and that the material does not absorb excessive moisture, given the model's underwater use. Low-quality straps can present irregular tapering that causes lateral play.
How long does a leather strap last on the Seamaster Diver 300M?
A premium leather strap (alligator or vegetable-tanned calf) lasts 3-5 years with daily use, developing a natural aesthetic patina. If frequently exposed to salt water or chlorine, the lifespan reduces to 18-24 months. We recommend rotating leather straps with rubber alternatives during summer or in intensive aquatic environments.
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
The atelier's website: casatimilano.com