Omega · Speedmaster Moonwatch

Strap for Speedmaster Professional Moonwatch Apollo XVII 45th Anniversary / Yellow 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 diameter42 mm
Reference311.63.42.30.03.001 (aka: 31163423003001)
FamilySpeedmaster Moonwatch
MovementOmega caliber 1863 hours, minutes, small seconds | Chronograph
Year2017/1 - 2017
CaseYellow 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 Moonwatch 311.63.42.30.03.001 (aka: 31163423003001)

Selected for the 20 mm lug width · workshop selection

All 20 mm straps →

The Speedmaster Moonwatch 311.63.42.30.03.001 (aka: 31163423003001), seen from the bench

The Speedmaster Professional Moonwatch Apollo XVII 45th Anniversary in 18k yellow gold, model 311.63.42.30.03.001, features a 42mm case diameter and a manual Omega 1863 caliber movement. This is the only chronograph certified by NASA for extravehicular activities. The watch combines its storied space heritage with fine metallurgy, featuring a column-wheel chronograph mechanism, 18,000 vibrations per hour, and 48 hours of power reserve. Strap size is 20mm.

Frequently asked questions

What is the lug width of the Omega Speedmaster Moonwatch 311.63.42.30.03.001?

The Omega Speedmaster Moonwatch model 311.63.42.30.03.001 mounted in yellow gold has a <a href="/pages/termine-glossario/misura-ansa">lug width</a> of 20mm. This width is characteristic of all Speedmaster Professional from the most recent generations and is the fundamental parameter for identifying straps compatible with this reference.

Which strap materials are most suitable for a yellow gold Speedmaster Moonwatch?

Yellow gold 18k particularly enhances straps in <a href="/pages/termine-glossario/alligatore">alligator</a> with fine grain texture and natural patina, or vintage calf with accelerated aging. Both develop a chromatic richness that harmonizes with the warm tone of the case. For sporty versatility, a black nylon NATO creates contemporary contrast; for formal elegance, <a href="/pages/termine-glossario/shell-cordovan">shell cordovan</a> with <a href="/pages/termine-glossario/concia-vegetale">vegetable tanning</a> offers tactile fullness without competing with the yellow.

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

The Speedmaster Moonwatch features straight lugs (not curved) of 20mm, accessible with a simple spring bar tool. Position the watch on a soft pad, insert the tool tip into the small recess beneath the lug to compress the internal spring, gently extract and replace the strap. A 30-second operation for those with experience; we nonetheless recommend doing it first in the safety of our atelier if it is your first time.

Are aftermarket straps available compatible with the 311.63.42.30.03.001?

Yes, all straps with <a href="/pages/termine-glossario/misura-ansa">lug width</a> of 20mm are compatible. Milano Straps offers a specialized collection of <a href="https://milanostraps.it/collections/cinturini-orologi-per-misura-ansa-20mm">20mm straps</a> in various materials (alligator, calf, deer leather, FKM rubber), customizable in length, initials and stitching thread. For yellow gold, we recommend leathers with discrete grain: the goal is to make the case shine, not the strap.

What is the average lifespan of a leather strap on a watch like the Speedmaster?

The durability of a leather strap depends on the quality of the material and usage. A natural <a href="/pages/termine-glossario/alligatore">alligator</a> or quality artisanal vegan calf guarantees 3-4 years if worn daily; with rotation (2-3 times a week) it extends to 6-8 years. Shell cordovan exceeds 10 years thanks to fiber density. Milano Straps provides an 18-month warranty on artisanal products and recommends periodic maintenance: avoid salt water, dry after rain, condition with neutral balm every 6 months.

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