Omega · Speedmaster (Non-Moonwatch)

Strap for Speedmaster Date 38 Stainless Steel / Black / Albertville Winter Olympics

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

Lug width18 mm
Case diameter38 mm
Reference3811.50.JO
FamilySpeedmaster (Non-Moonwatch)
MovementOmega caliber 1155 hours, minutes, small seconds | date, day | Chronograph
Year1992 - 1992
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

All Omega spring barsOpen →

Straps for the Speedmaster (Non-Moonwatch) 3811.50.JO

Selected for the 18 mm lug width

All 18 mm straps →

The Speedmaster (Non-Moonwatch) 3811.50.JO, seen from the bench

The Speedmaster Date 38 Stainless Steel reference 3811.50.JO is a chronograph featuring the column-wheel caliber 1155, designed for contemporary wrists with a 38 mm stainless steel case diameter. The 18 mm lug width accommodates specific strap requirements without compromise on legibility or structural integrity. This model maintains the technical precision characteristic of the Speedmaster family while adopting moderate proportions suited to modern wear.

Frequently asked questions

What is the lug width of the Omega Speedmaster (Non-Moonwatch) 3811.50.JO?

The 3811.50.JO model is equipped with an 18 millimeter lug width. This measurement requires straps specifically made in 18mm, as it represents a less common standard compared to modern 20mm or 22mm sizes. It is essential to measure accurately perpendicular to the case lugs to ensure proper fit without lateral rippling.

What is the best strap for the Omega Speedmaster 3811.50.JO?

The choice depends on usage and aesthetic preferences. Alligator represents the prestige benchmark, with natural grain that pairs perfectly with brushed steel. Vegetable-tanned calf offers evolving patina over time. NATO nylon guarantees versatility and practicality for frequent changes. FKM rubber is ideal for sports or aquatic contexts. We recommend black alligator with grey thread for uncompromised elegance.

How do you change the strap on an Omega Speedmaster?

The change is a delicate manual operation. Use a spring bar tool extractor to open the attachments without scratching the case. Position the tool perpendicular to the pin, gently push downward to release the internal spring. Once the pin is extracted, remove the old strap. Insert the new one by aligning it to the attachments, then reinsert the pin until the locking click. Verify that the strap is perfectly aligned before wearing the watch.

Can I use an 18mm aftermarket strap on this reference?

Yes, provided the strap is specifically made in 18mm. Milano Straps offers artisanal straps compatible and ready for shipment, customizable in leathers, sizes and stitching details. The Casati Milano atelier also creates bespoke straps with personal leather selection and 18-month warranty, ensuring perfect compatibility with original Omega attachments.

How long does a natural leather strap last on an Omega Speedmaster?

A quality alligator or calf strap, used in rotation with others (recommended for preservation), has an average lifespan of 3-5 years before visible signs of wear. With vegetable tanning, the leather develops a fascinating patina that extends its aesthetic appreciation. Durability depends on use (sport vs. formal), sun exposure and maintenance operations. Annual conditioning with specific products significantly extends useful life.

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