Omega · Speedmaster (Non-Moonwatch)
Strap for Speedmaster Date 38 Stainless Steel / Diamond / Purple / Bracelet
Takes 18 mm straps. Verified lug width, the straps that fit this model, and answers to the most common questions.
Lug width
Recommended spring bar
The Speedmaster (Non-Moonwatch) 324.15.38.40.10.001 (aka: 32415384010001), seen from the bench
Frequently asked questions
What is the lug width of the Omega Speedmaster (Non-Moonwatch) 324.15.38.40.10.001?
The lug width is 18mm. This specification is specific to the 324.15.38.40.10.001 model in the 38mm version. To verify compatibility, position a digital caliper between the spring bar pins: the external distance must correspond to 18mm. Do not confuse with larger Speedmaster models, which feature 20mm or 22mm lugs.
What is the best strap for the Speedmaster 38mm 324.15.38.40.10.001?
The choice depends on usage and your watch's dial. Vegetable-tanned alligator represents the most sophisticated solution, ideal for formal contexts. Vegetable-tanned calf is recommended for those desiring natural patina over time. Japanese shell cordovan offers maximum structural rigidity. For summer or sporty use, vulcanized natural rubber or NATO are valid and durable alternatives.
How do you change the strap on the Speedmaster 324.15.38.40.10.001?
The change is simple. Rotate the watch with the case facing upward, locate the spring bar on both sides of the lug. Press slightly toward the inside of the pins to disengage the original strap. Remove the old strap and insert the new one by aligning the holes to the case lugs, pushing until the spring bar clicks into position. The process takes less than two minutes and requires no special tools.
Is an aftermarket 18mm strap compatible with the Speedmaster 324.15.38.40.10.001?
Yes, provided the lug width is certified at 18mm. Always verify the technical specifications before purchase. Bespoke straps crafted by Casati Milano guarantee perfect compatibility and can be customized in length, material (alligator, calf, shell cordovan), and finishing. Compatible 18mm straps ready for shipment are available on the milanostraps.it website.
How long does a leather strap last on the Speedmaster 38mm?
Durability depends on the material and daily use. A vegetable-tanned alligator strap resists 4-6 years with ordinary care (drying after water exposure, protection from intense UV rays). Vegetable-tanned calf has similar durability but develops visible patina after 12-18 months. Japanese shell cordovan can last 8-10 years while maintaining structural rigidity. Vulcanized natural rubber lasts 3-4 years before losing elasticity. With proper maintenance (annual leather conditioning, regular drying), Casati Milano bespoke straps guarantee 18 months of certified durability and can significantly exceed it.
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