Omega · Speedmaster Reduced

Strap for Speedmaster Reduced Ladies Stainless Steel / Diamond / MOP

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

Lug width18 mm
Case diameter39 mm
Reference3815.76.31
FamilySpeedmaster Reduced
MovementOmega caliber 3220 Hours, Minutes, Small Seconds | Chronograph
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 →

The Speedmaster Reduced 3815.76.31, seen from the bench

The Omega Speedmaster Reduced 3815.76.31 is a mechanical chronograph designed for authentic timekeeping without the bulk of the Professional model. Presented in 1998, it features a 39mm stainless steel case, 18mm lug width, and maintains the lunar heritage of the historic Speedmaster while offering contemporary proportions. Powered by the Omega 3220 automatic caliber, it includes chronograph functions, hours, minutes, small seconds, and offers 100m water resistance with anti-reflective sapphire crystal.

Frequently asked questions

What lug width does the Omega Speedmaster Reduced 3815.76.31 have?

The Omega Speedmaster Reduced 3815.76.31 features an 18mm lug width. This measurement is the distance between the spring bars that connect the strap to the case: it represents the standard dimension for this model and perfectly accommodates 18mm straps available in our catalog.

Which strap is best suited for the Speedmaster Reduced 3815.76.31?

The choice depends on usage: for formal elegance we recommend black alligator with steel deployant; for superior durability and fascinating patina, shell cordovan represents the most advanced technical choice; for aesthetic and tactile sustainability, vegetable-tanned calf develops a visible history over time. The Speedmaster Reduced, thanks to its calibrated 39mm proportion, also accommodates sport straps in satin rubber or NATO without losing authority.

How do you change the strap on an Omega Speedmaster Reduced?

The procedure requires a specific tool (spring bar tool) to extract the spring bars from the case lugs. Position the strap on a flat surface, insert the tool tip into the thin hole of the spring, press gently until the bar retracts, and remove the strap. Repeat on the other side. Installing the new strap follows the reverse procedure: align the holes, reinsert the spring bars with calibrated pressure until they click into place. If you prefer to avoid risk, the Casati Milano atelier performs the change with guaranteed precision.

Can I mount an aftermarket strap on my Speedmaster Reduced 3815.76.31?

Yes, any strap compatible with 18mm lug width can be mounted on the case. Milanostraps are specifically designed for this measurement and guarantee perfect structural compatibility. Before purchase, verify the lug width of your watch to avoid ordering errors.

How long does a leather strap last on a chronograph like the Speedmaster Reduced?

A quality alligator or calf strap, with proper maintenance (periodic cleaning, drying after water contact, conditioning every 6-8 months), lasts between 3 and 5 years. Shell cordovan, thanks to its superior molecular density, can reach 7-10 years. Our service includes an 18-month warranty on all custom-made straps created by the Casati Milano atelier.

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