Strap for Speedmaster Broad Arrow Co-Axial Rattrapante Stainless Steel / Panda / Bracelet

The lug width of the Speedmaster Broad Arrow 3582.31.00 is 21 mm. This dimension is precise and corresponds to the distance between the inner lugs of the case. To verify it, measure with a digital caliper the internal space between the two lugs at their narrowest point. The 21 mm is the specific standard for this 44.25 mm case and ensures balanced proportions between watch and wrist.

Alligator represents the most versatile and elegant choice, offering symmetric natural grain and superior resistance over time. Vegetable-tanned calf leather is excellent for those who appreciate generous patina and conscious aging. For sports use, FKM rubber maintains the technical character of the instrument intact. Canvas NATO is the most informal solution, perfect for highlighting the military origins of the model, although with this 44.25 mm case it acquires a preponderant presence.

Changing the strap on the Broad Arrow requires the use of simple tools: a spring bar tool (small instrument with a flat or bifurcated tip). Position the watch on a stable surface, insert the tool's tip into the lug hole, gently lift the internal spring, and the connecting pin (spring bar) slides out. Repeat for the other lug, then insert the new strap by aligning the holes and pressing until you feel the spring's click closing.

Yes, any strap with a 21 mm lug width is perfectly compatible with the Broad Arrow 3582.31.00. Always verify the width before purchase: the 21 mm is the specific standard of this case. On milanostraps.it you will find a wide selection of 21 mm straps in alligator leather, calf, rubber and other materials, customizable in sizes, color and stitching details.

Durability depends on the material and usage. A quality alligator strap, with vegetable tanning, can last 5-7 years under normal daily use conditions, developing a beautiful patina over time. Calf leather with vegetable tanning has similar longevity but develops patina more rapidly and intricately. Leather straps benefit from regular maintenance: avoid prolonged exposure to direct sunlight, extreme humidity, and periodically clean with a soft cloth. The best ateliers, such as Casati Milano, offer 18-month warranties on their straps.