Strap for Speedmaster HB-SIA Co-Axial GMT Titanium / Black Carbon / Bracelet

The lug width is 21 mm. This spacing is the standard for this titanium case and determines the internal width that the strap must have to fit correctly between the lugs. Always measure with a caliper or ruler between the two lugs on the bare case, at the narrowest point of the gap, to verify compatibility before purchase.

It depends on use and aesthetic preference. For elegance and durability we recommend alligator or vegetable-tanned calf; for sport practicality a Cordura canvas NATO or heat-resistant FKM rubber. Alligator enhances the raw titanium of the case, calf offers a patina that ages with dignity, NATO guarantees maximum operational resilience.

Remove the watch from your wrist and place it on a soft surface. Use a spring bar tool (a specific instrument with a small lever) to compress the removable pins at the ends of the strap. Compress one side at a time and slide the strap upward to free the lug. Insert the new strap by aligning the holes, then secure the pins on both lugs using the same tool.

Yes, provided it is compatible with the 21 mm lug width. MilanoStraps offers a complete collection of 21 mm straps ready to ship, customizable in leather, color and thread stitching. Atelier Casati Milano also creates custom straps with personal consultation and 18-month warranty.

A strap with vegetable tanning lasts on average 3-5 years of daily use, with variability depending on climate (humidity, UV rays) and maintenance. Rubber and NATO are more durable (7-10 years), but still require periodic cleaning and protection from prolonged sun exposure. MilanoStraps offers 18-month warranty on all artisanal straps.