Omega · X-33 / Z-33

Strap for Speedmaster X-33 Titanium / Bracelet / Pilot

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
Reference3291.52.00 (aka: 32915200)
FamilyX-33 / Z-33
MovementOmega caliber 1666 hours, minutes, small seconds, Additional 24 hours Hand (adjustable) | date, month, perpetual calendar, year indicator | Chronograph, countdown, Flyback, Foudroyante, Rattrapante | alarm
Year2001 - 2006
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

All Omega spring barsOpen →

Straps for the X-33 / Z-33 3291.52.00 (aka: 32915200)

Selected for the 20 mm lug width · workshop selection

All 20 mm straps →

The X-33 / Z-33 3291.52.00 (aka: 32915200), seen from the bench

The Omega Speedmaster X-33 Titanium (ref. 3291.52.00) is a pilot's chronograph developed through a decade-long collaboration between Omega and the French Air Force for hypersonic flight and extreme operations. Powered by the Omega 1666 thermally compensated quartz caliber with COSC-certified accuracy of ±1.5 seconds per year, it features a 42mm grade 2 titanium case, split-seconds chronograph, reversible countdown, perpetual calendar, and mission-syncable alarm. The 20mm lug width accommodates pressurized flight suits, while the opaque black dial combines digital and analog indices for cockpit legibility. Water-resistant to 100 meters.

Frequently asked questions

What is the lug width of the Omega X-33 / Z-33 3291.52.00?

The lug width is exactly 20 millimeters. This measurement is characteristic of the model and not interchangeable with the 22mm of other Seamaster models or the 18mm of Omega dress models. To verify it, use a digital caliper positioned perpendicularly between the lug attachment holes.

What strap is recommended for the Omega X-33 / Z-33?

The best strap depends on use: authentic alligator for tactical operations (enhances the avinic profile), vegetable-tanned calf for daily elegance (develops a fascinating grayish patina), burgundy shell cordovan for modern color statements. All require a precise 20mm lug width.

How do I change the strap on my Omega X-33 / Z-33 3291.52.00?

Position the watch face down on a soft cloth. Locate the lug attachment holes (one per side). Use a dedicated tool (spring bar tool) to release the internal spring of the pin present in each lug, extracting it gently upward. Remove the old strap, insert the new one aligning it with the holes, then reinsert the pins until the locking click.

Can I use an aftermarket 20mm strap on an original Omega watch?

Yes, provided the strap is constructed to 20mm lug specifications and the spring bar has a standard diameter of 1.5mm. Quality handcrafted straps maintain complete compatibility with original Omega lugs. We recommend verifying tolerances with the supplier before purchase, especially for thin leathers such as alligator or shell cordovan.

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

A quality leather strap (alligator, calf or shell cordovan) with vegetable or mineral tanning lasts an average of 3-5 years if worn daily, up to 7-10 years with rotation with other straps. Exposure to intense humidity (pressurized environments, water operations) reduces durability. The Casati Milano warranty covers 18 months against manufacturing defects, regardless of natural 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.

Request an appointment →

Casati Milano · Via XX Settembre 15, Milan · by appointment only