Omega · Speedmaster (Non-Moonwatch)

Strap for Speedmaster Date 40 Stainless Steel / Red Gold / Black / Bracelet

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

Lug width20 mm
Case diameter40 mm
Reference323.21.40.40.01.001 (aka: 32321404001001)
FamilySpeedmaster (Non-Moonwatch)
MovementOmega caliber 1164 hours, minutes, small seconds | date | Chronograph
CaseRed Gold, Stainless 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) 323.21.40.40.01.001 (aka: 32321404001001)

Selected for the 20 mm lug width · workshop selection

All 20 mm straps →

The Speedmaster (Non-Moonwatch) 323.21.40.40.01.001 (aka: 32321404001001), seen from the bench

The Speedmaster with reference 323.21.40.40.01.001 is equipped with the Omega caliber 1164 with functions of hours, minutes, small seconds, date and chronograph. The movement offers a distinct technical configuration compared to the traditional Moonwatch version. The case has standard proportions for the Speedmaster collection with lugs integrated into the characteristic model design.

Frequently asked questions

What is the lug width of the Omega Speedmaster Non-Moonwatch 323.21.40.40.01.001?

The lug width of this model is 20 millimetres. Always verify the measurement personally using a digital calliper, positioning it between the lateral attachment lugs of the case. A 19 millimetre strap would be loose; a 21 millimetre strap would not fit smoothly. Compatibility is a fundamental prerequisite.

Which strap is most suitable for the 323.21.40.40.01.001 red gold and steel two-tone?

Cognac brown alligator offers sophisticated aesthetic contrast and emphasizes the warmth of red gold. For those preferring contrast, a black alligator strap creates fascinating tension. A vegetable-tanned calfskin in burgundy tones represents an elegant middle ground. For everyday versatility, a navy Cordura NATO strap or an FKM rubber strap ensures functional practicality.

How do I change the strap on my Omega Speedmaster 323.21.40.40.01.001?

Obtain a spring bar removal tool. Position the watch with a magnifying lens, gently lift one of the lateral lugs using the tool, slide the strap outward. Align the new strap with the lug holes, insert the spring bar into the strap loops and verify that it is fully locked. Consult visual tutorials for the first time; the operation requires patience, not force.

Can I use an aftermarket strap compatible with the 323.21.40.40.01.001?

Absolutely yes. A 20 millimetre aftermarket strap is compatible if manufactured to artisanal quality standards. Verify that the width is precise and that the spring bars are of the same size. Straps crafted by specialized artisans ensure coherent aesthetics and superior durability compared to mass-produced products. Casati Milano atelier offers complete customization with leather selection.

What is the average lifespan of a leather strap for daily use?

A high-quality artisanal leather strap, with vegetable or alligator tanning, lasts an average of 2–4 years of regular daily wear. Lifespan depends on frequency of wear, climatic conditions, water exposure and maintenance. A strap requires protection from direct impact, drying after moisture exposure and occasional conditioning with natural oils. Casati Milano atelier guarantees 18 months coverage against manufacturing defects.

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