Strap for Speedmaster Professional Moonwatch Alaska Project IV

The Omega Speedmaster ST 186.004 Alaska has a lug width of 20mm. This measurement is crucial for aftermarket strap compatibility. To verify it, measure the internal distance between the lugs of the case using a digital caliper; the value must correspond exactly to 20mm so that the strap fits perfectly without misalignment.

Given the model's exploratory and robust vocation, we recommend three options: a chocolate brown alligator for lasting elegance, a grey-anthracite NATO for tactical practicality, or a black FKM rubber for extreme conditions. The choice depends on the context of use: if formal-adventurous, choose alligator; if frequent outdoor use, opt for NATO or rubber.

Remove the watch from your wrist and place it on a soft surface. Use a spring bar tool (specific tool for the strap springs) to gently push the spring downward, freeing the end of the old strap. Repeat the operation on the other lug, then insert the new strap lugs in the same manner. Make sure the springs are properly seated.

Yes, absolutely. Any strap with a 20mm lug width is compatible. You will find a wide selection of materials online: alligator, calf, shell cordovan, canvas NATO, technical rubber. MilanoStraps offers 20mm straps ready to ship with customization options, and Casati Milano creates bespoke straps with personalized consultation.

A quality leather strap (alligator or calf) lasts an average of 3-5 years under moderate use conditions, developing a pleasant patina. In case of intensive use or prolonged exposure to moisture, the lifespan can be reduced to 2-3 years. MilanoStraps guarantees 18 months on bespoke straps created by the Casati Milano atelier, covering manufacturing and material defects.