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Omega · X-33 / Z-33

Strap for Speedmaster X-33 Titanium / Black / Bracelet

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 diameter42 mm
Reference3290.50.00
FamilyX-33 / Z-33
MovementOmega caliber 1666 Hours, Minutes, Small Seconds, Additional 24 Hour Hand (adjustable) | Date, Month, Perpetual Calendar, Year Indicator | Chronograph, Countdown, Flyback, Foudroyante, 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 3290.50.00

Selected for the 20 mm lug width · workshop selection

All 20 mm straps →

The X-33 / Z-33 3290.50.00, seen from the bench

The Omega X-33 is a multifunctional timepiece developed in collaboration with space agencies for professional use. It features the Omega caliber 1666 with chronograph, countdown, perpetual calendar and dual time zone functions via the adjustable 24-hour hand. The lugs have a width of 20mm for the strap.

Frequently asked questions

What is the exact lug width of the Omega X-33 / Z-33 3290.50.00?

The lug width of the 3290.50.00 is 20mm. This value represents the external distance between the two lateral attachment lugs of the case. Any compatible strap must have an exact width of 20mm to avoid vertical play or insertion difficulties. Measurement is performed with a digital caliper between the metal pins of the case.

What is the best strap for the Omega X-33 / Z-33 in titanium?

The best strap depends on use: for aviation and formal contexts, alligator in vegetable tanning navy blue or black is recommended (natural patina develops over time). For daily and recreational use, European calf in brown or grey-taupe offers aesthetic versatility. For tactical or marine environments, NATO straps in military-grade cordura or vulcanized rubber guarantee practicality and water resistance. Compatibility requires 20mm lug width.

How do you change the strap on an Omega X-33 / Z-33 watch?

Procedure: 1) Use a spring bar tool to compress the metal pin of the right lug while extracting the old strap laterally. 2) Repeat on the left side. 3) Insert the new strap by aligning the holes to the lugs, ensuring the pin returns to locked position. 4) Verify that the strap is not rotating around the pin (indicator of correct locking). For thick leather straps, the change requires millimeter precision given the 20mm lug width.

Which aftermarket straps are compatible with the 3290.50.00?

All straps with 20mm lug width are compatible. In the milanostraps.it catalog you will find alligator in vegetable tanning, European calf, shell cordovan, NATO straps and rubber for your Omega. Compatibility is guaranteed by the standard 20mm lug width; it is essential to verify that the strap does not have excessive thickness where it enters the lugs (maximum 4-5mm overall for thick lugs).

How long does a leather strap last on the Omega X-33 / Z-33?

Durability depends on material and use. An alligator or calf strap in vegetable tanning, with regular care (quick drying after moisture, avoiding prolonged sun exposure), maintains legibility and resistance for 5-7 years of daily use. Shell cordovan, due to its density and natural oiliness, can last 10+ years. The patina developed becomes an aesthetic characteristic. NATO straps have greater durability (8-10 years) due to synthetic material resistance. Standard Casati Milano warranty is 18 months from manufacturing.

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