Omega · Speedmaster First Omega in Space

Strap for Speedmaster First Omega in Space Sedna Gold

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
Reference311.63.40.30.02.001 (aka: 31163403002001)
FamilySpeedmaster First Omega in Space
MovementOmega caliber 1861 Small Seconds, Hours, Minutes | Chronograph
CaseSedna Gold

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 First Omega in Space 311.63.40.30.02.001 (aka: 31163403002001)

Selected for the 20 mm lug width · workshop selection

All 20 mm straps →

The Speedmaster First Omega in Space 311.63.40.30.02.001 (aka: 31163403002001), seen from the bench

The Speedmaster First Omega in Space commemorates Walter Schirra's 1962 orbital flight, when he became the first astronaut to wear an Omega in space. The model is powered by the manual-winding caliber 1861 with chronograph and small seconds functions. The case measures 39.7mm with 19mm lugs.

Frequently asked questions

What is the lug width of the Omega Speedmaster First Omega in Space 311.63.40.30.02.001?

The lug width of the Speedmaster First Omega in Space 311.63.40.30.02.001 is 20mm. This is the distance between the two internal points where the strap inserts into the case lugs. On milanostraps.it you will find the complete collection of 20mm compatible straps, with customization options in length, color, and stitching thread.

What is the best strap for the Omega Speedmaster First Omega in Space in Sedna Gold?

For Sedna Gold, we recommend tobacco or cognac brown alligator: the regular fine grain texture amplifies the case's preciousness without competing chromatically. Alternatively, warm beige vegetable-tanned calf creates elegant contrast allowing the Sedna to emerge. Shell cordovan is not recommended due to its mirror finish that would compete with the rose gold.

How do you measure the lug width to change the strap?

Lug width measurement is performed by positioning a digital caliper between the two internal points where the strap inserts (the attachments to the case lugs). For the Speedmaster First Omega in Space 311.63.40.30.02.001, the distance will be exactly 20mm. It is important not to confuse this measurement with the case diameter (39.70mm) or the total width of the worn strap.

Which aftermarket straps are compatible with this Speedmaster?

All straps with 20mm lug width are compatible with the Omega Speedmaster First Omega in Space 311.63.40.30.02.001. On milanostraps.it the complete collection of 20mm straps includes alligator, vegetable-tanned calf, NATO, FKM rubber, and shell cordovan, customizable in length and finishes. Each strap is available with deployant clasp in titanium or satin steel.

How long does a leather strap last for this Speedmaster?

An alligator or calf strap of artisanal quality, like those from milanostraps.it and Casati Milano, has an estimated lifespan of 5-7 years with regular use. Longevity depends on frequency of use, exposure to water and sweat, and maintenance. Vegetable-tanned calf develops natural patina over time, improving aesthetically. Casati Milano offers an 18-month warranty on made-to-measure straps, with the possibility of periodic reconditioning.

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