Omega · Speedmaster (Non-Moonwatch)
Strap for Speedmaster Moonwatch Co-Axial White Side of the Moon Diamond
Takes 21 mm straps. Verified lug width, the straps that fit this model, and answers to the most common questions.
Lug width
Straps for the Speedmaster (Non-Moonwatch) 311.98.44.51.55.001 (aka: 31198445155001)
Selected for the 21 mm lug width · workshop selection
Matte Black Alligator Strap€195
Matte Dark Gray Alligator Strap€195
Millennium Green Alligator Strap€195
Grey Hammered Leather Strap with Ecru Stitching€98
Hammered Calfskin Strap Light Blue€98
The Speedmaster (Non-Moonwatch) 311.98.44.51.55.001 (aka: 31198445155001), seen from the bench
Frequently asked questions
What is the lug width of the Omega Speedmaster (Non-Moonwatch) 311.98.44.51.55.001?
The lug width is 21mm. This dimension is specific to the model and is essential when selecting an aftermarket strap. To verify it, measure the internal distance between the spring bars: 21mm precisely guarantees complete compatibility with any strap of that size.
What is the best strap for the Speedmaster (Non-Moonwatch) 311.98.44.51.55.001 in grey ceramic?
Vegetable-tanned alligator with coarse grain, preferably in aged cognac or pearl grey, creates the most refined aesthetic balance with the ceramic case. An excellent alternative is shell cordovan in burgundy tones. For pure sportiness, an anthracite grey NATO or black FKM rubber maintain the chronograph's austerity.
How do I change the strap on my Omega Speedmaster (Non-Moonwatch)?
Use a spring bar tool to gently remove the spring bars from the lugs. Insert the forked tip of the tool between the lug and the spring bar, applying light pressure to extract the bar from its seat. Repeat on the other side, then insert the new spring bars into the aftermarket strap, ensuring the lug width is 21mm.
Can I use a 21mm aftermarket strap with my 311.98.44.51.55.001?
Yes, completely compatible. Ensure that the strap is specifically sized at 21mm (lug width) and that the spring bar is calibrated for this width. Casati Milano straps and models available online at milanostraps.it for the 21mm size are tested for complete compatibility.
How long does a leather strap last on a watch like the Omega Speedmaster (Non-Moonwatch)?
A quality leather strap (alligator, cordovan, calf in vegetable tanning) lasts 3-5 years of daily use. Duration depends on frequency of use, exposure to sweat and humidity, and maintenance (periodic cleaning and conditioning). Casati Milano straps come with an 18-month warranty excluding 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

