Omega · Speedmaster (Non-Moonwatch)

Strap for Speedmaster Date 39 Stainless Steel / Black - Silver

Takes 18 mm straps. Verified lug width, the straps that fit this model, and answers to the most common questions.

Lug width

18mm

18 mm straps All Omega

Lug width18 mm

Case diameter39 mm

Reference3811.50.01 (aka: ST 175.0043, 38115001)

FamilySpeedmaster (Non-Moonwatch)

MovementOmega caliber 1152 hours, minutes, small seconds | date | Chronograph

Year1992 - 1998

CaseStainless Steel

Recommended spring bar

Spring bars Omega 18mm — single diameter

Technical match for lug width and diameter · lug 18 mm · Ø 1.8 mm

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Straps for the Speedmaster (Non-Moonwatch) 3811.50.01 (aka: ST 175.0043, 38115001)

Selected for the 18 mm lug width

All 18 mm straps →

The Speedmaster (Non-Moonwatch) 3811.50.01 (aka: ST 175.0043, 38115001), seen from the bench

The Speedmaster reference 3811.50.01 is equipped with the Omega caliber 1152 with hour, minute, small second, date, and chronograph functions. The model features 18mm lugs and is part of the Speedmaster Non-Moonwatch collection. The movement offers date indication in addition to the classic chronograph functions.

Frequently asked questions

What is the lug width of the Omega Speedmaster 3811.50.01?

The Omega Speedmaster 3811.50.01 has a lug width of 18mm. This dimension is measured internally from one lug to the other and is essential for selecting a compatible strap. On a 39mm case, the 18mm lug width ensures the correct proportion and functionality.

Which strap should I choose for the 3811.50.01?

For the Speedmaster 3811.50.01 we recommend: alligator dyed in cognac brown or black for artisanal elegance; shell cordovan for those who appreciate natural aging; Tuscan vegetable-tanned calf for soft hand and sustainable tanning; polyester NATO for sporty use. All available in 18mm size at milanostraps.it.

How do I change the strap on my Omega Speedmaster?

Remove the watch from the previous strap by pushing the spring bar (the elastic pin) downward with a flat tool. Once the lugs are free, insert the new strap by aligning the holes to the center of the lug and reinsert the spring bar. Verify that the strap is secure before wearing.

Is an 18mm strap compatible with other Omega watches?

Yes, any Omega watch with an 18mm lug width is compatible with our straps. Always verify the internal lug width of your model: even slight fractional variations compromise fit. Consult your watch manual or contact us for confirmation.

How long does an artisanal leather strap like those from Casati Milano last?

A quality alligator or calf strap with vegetable tanning lasts 4-6 years of daily wear. Shell cordovan reaches 7-8 years. Durability depends on care, climate, frequency of wear and periodic maintenance (neutral cleaner, air drying). All Casati Milano straps come with an 18-month warranty.

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