Omega · Seamaster Diver 300M
Strap for Seamaster Diver 300M Quartz 36.25 Stainless Steel / Electric Blue / Bracelet
Takes 20 mm straps. Verified lug width, the straps that fit this model, and answers to the most common questions.
Lug width
Straps for the Seamaster Diver 300M 2063.80.00 (aka: 20638000)
Selected for the 20 mm lug width · workshop selection
Military Red Alligator Strap with Blue Stitching€183
Black and Red NATO Strap — Military Heritage€183
Black Crocodile Military Strap with Blue Stitching€183
Black Calfskin NATO Strap 20mm€80
Dark Brown Calfskin Military Strap€80
The Seamaster Diver 300M 2063.80.00 (aka: 20638000), seen from the bench
Frequently asked questions
What is the exact lug width of the Seamaster Diver 300M 2063.80.00?
The reference 2063.80.00 has a lug width of 20 mm. This width was chosen by Omega to maintain correct visual proportions on the 36.25 mm diameter case, ensuring a balanced aesthetic ratio between the case and strap. You can verify it by measuring with a caliper between the case lugs.
What is the best strap for the Seamaster Diver 300M mid-size?
There is no "best" strap in absolute terms, but the choice depends on usage. To maintain diving authenticity we recommend vulcanized rubber or NATO cordura. For everyday elegance, vegetable-tanned alligator or shell cordovan offer sophistication. Calf leather represents a versatile and classic compromise, suitable for both formal and informal contexts.
How do you change the strap on a Seamaster Diver?
Strap replacement is done by removing the spring bars that connect the case lugs to the original strap. Use a dedicated tool (spring bar tool) to press the pin on one side, gently extract it, then insert the new strap by positioning the pin in the lugs until you hear the locking click. Casati Milano atelier can assist in the process if you wish for personal consultation.
Are aftermarket straps compatible with the reference 2063.80.00?
Yes, all straps with 20 mm lug width are perfectly compatible with this Seamaster Mid-Size. Milano Straps are constructed to the same standards as premium manufacturers and feature superior quality elastic rings, guaranteeing secure and lasting fit over time.
How long does a natural leather strap last on a wristwatch?
A quality leather strap (alligator, calf, shell cordovan) lasts an average of 5-7 years with daily use, provided adequate maintenance: avoid prolonged exposure to salt sweat and water, dry promptly after occasional baths, and occasionally apply a conditioner for natural leathers. Vegetable-tanned leather, such as that used by Casati Milano, develops a patina that increases aesthetic character over time.
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

