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Omega · X-33 / Z-33

Strap for Skywalker X-33 Regatta ETNZ

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

Lug width

20mm
20 mm strapsAll Omega
Lug width20 mm
Case diameter45 mm
Reference318.92.45.79.01.001 (aka: 31892457901001)
FamilyX-33 / Z-33
MovementOmega caliber 5620 Additional 12 Hour Hand (adjustable), Additional 24 Hour Hand (adjustable), Hours, Minutes, Seconds | Date, Day, Month, Perpetual Calendar, Year Indicator | Chronograph, Countdown, Flyback, Rattrapante | Alarm
CaseTitanium

Recommended spring bar

Spring bars Omega 20mm — 1.8mm diameter

Technical match for lug width and diameter · lug 20 mm · Ø 1.8 mm

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Straps for the X-33 / Z-33 318.92.45.79.01.001 (aka: 31892457901001)

Selected for the 20 mm lug width · workshop selection

All 20 mm straps →

The X-33 / Z-33 318.92.45.79.01.001 (aka: 31892457901001), seen from the bench

The Omega X-33 / Z-33 318.92.45.79.01.001 is a pilot chronograph developed with ESA for the International Space Station. It features a 45mm titanium case with unidirectional bezel, helium escape valve, and sapphire crystal. The Omega 5620 quartz caliber includes column-wheel chronograph, split-seconds function, countdown with flyback, dual 12/24-hour display, and perpetual calendar. The 20mm lug width is proportioned to the case diameter for pilot and astronaut wrist compatibility.

Frequently asked questions

What is the exact lug width of the Omega X-33 / Z-33 318.92.45.79.01.001?

The lug width is 20mm. This is the space between the lugs (the metal projections that attach the strap to the case). You can verify this by measuring the distance between the two lugs with a ruler or digital caliper.

What is the best strap for the Omega X-33 318.92.45.79.01.001?

It depends on use and dial. For formal elegance, we recommend dark brown or black alligator with contrasting stitching. For daily-sports use, cognac-colored calf or a raw-weave NATO strap. FKM rubber is ideal for water activities. We advise against shell cordovan: it appears undersized visually against the massive 45mm titanium case.

How do I change the strap on my X-33 / Z-33?

Get a spring bar tool (small instrument with two curved ends). Position the tip in the lateral slot of the lug, gently push toward the case center to compress the internal spring, then extract the pin. Repeat on the other side. Insert the new strap by aligning the pins in their seats and press until it clicks. Do not force: the pin should enter with light pressure.

Is an aftermarket strap guaranteed compatible with the 318.92.45.79.01.001?

Yes, if the lug width is 20mm. All 20mm straps (made by Omega, third-party brands, or artisans) mount without issues. Milanostraps.it offers an entire collection of 20mm straps tested, with compatibility guarantee and customization options (lengths, initials, stitch color).

How long does a leather strap last on my Omega X-33?

Durability depends on material and use. A Milanostraps alligator or quality calf lasts 3-4 years with moderate daily use. If exposed to moisture, sweat, or prolonged UV, the patina evolves (dark coloration) but mechanical resistance remains. We recommend the 18-month warranty from Casati Milano for risks of delamination or abnormal wear.

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