Omega · Speedmaster (Non-Moonwatch)

Strap for Speedmaster Michael Schumacher Stainless Steel / Silver / Bracelet / The Legend Silver

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

Lug width20 mm
Case diameter42 mm
Reference3506.31.00 (aka: 35063100)
FamilySpeedmaster (Non-Moonwatch)
MovementOmega caliber 3301 Hours, Minutes, Small Seconds | Date | Chronograph, Column wheel
CaseStainless Steel

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 Speedmaster (Non-Moonwatch) 3506.31.00 (aka: 35063100)

Selected for the 20 mm lug width · workshop selection

All 20 mm straps →

The Speedmaster (Non-Moonwatch) 3506.31.00 (aka: 35063100), seen from the bench

The Speedmaster 3506.31.00 is a racing chronograph from Omega's Professional line, evolved in the 1990s. It features the manual-wound caliber 3301 movement with 48-hour power reserve, central column-wheel chronograph, and date display. The case measures 42mm in diameter, crafted in brushed stainless steel with fixed bezel and tachymeter scale. Water resistance reaches 50 meters for daily wear. The 20mm lug width is a specific Omega design choice for proportional balance with the 42mm case.

Frequently asked questions

What is the lug width of the Omega Speedmaster 3506.31.00?

The lug width is 20mm, a specific standard for this model. To verify, measure with a digital caliper the distance between the two case lugs: it must correspond exactly to 20mm. Do not confuse it with the lug height (spring bar positioning), which remains standard.

Which strap do you recommend for the Omega Speedmaster (Non-Moonwatch) 3506.31.00?

We recommend vegetable-tanned alligator for elegance and evolving patina, brushed calf for daily durability, shell cordovan for long-term investment, or NATO cordura for sports use. The choice depends on the balance between aesthetics and the intended use context of the chronograph.

How do I change the strap on my Speedmaster 3506.31.00?

Locate the spring bars (metal bars that support the strap in the case lugs). Using a spring bar tool, gently press the bar toward the center to free the old strap. Insert the new strap by aligning the holes and release the bar. Verify that it is firmly positioned before wearing the watch.

Which aftermarket straps are compatible with the Omega 3506.31.00?

Only straps with a 20mm lug width are compatible. On milanostraps.it you will find a selection of artisanal leather in this size, all customizable. Standard 18mm and 22mm sizes do not fit the lug attachment of this model.

How long does a natural leather strap last on a Speedmaster like the 3506.31.00?

A high-quality artisanal leather strap, with vegetable tanning, lasts 3-5 years of regular wear. Durability depends on frequency of wear, ambient humidity, maintenance (drying after perspiration), and leather type. Japanese shell cordovan tends to last longer. Casati Milano guarantees 18 months on custom-made straps.

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