Strap for N° 03

The lug width (or ansa width) of the AM901 is 20mm. This measurement represents the distance between the two lugs on the case and is the critical parameter for determining strap compatibility. You can verify it by positioning a digital calliper perpendicularly between the lugs: the correct measurement must be exactly 20.00mm. This dimension is standard in the premium segment and provides access to a wide range of high-quality artisanal straps.

The choice depends on personal use and aesthetic sensibility, but the AM901 achieves maximum aesthetic coherence with a vegetable-tanned leather strap featuring natural patina. This material amplifies the minimalist philosophy of the case, creating a sober chromatic dialogue where time becomes visible on the leather surface. An excellent alternative is premium calf leather with fine grain, offering discreet elegance and superior comfort. For sports or maritime use, a natural rubber strap guarantees extreme durability while maintaining the model's aesthetic code.

Strap replacement requires a spring bar tool (a specific instrument for removing lug springs). Procedure: position the spring bar tool under the lug on the case, apply gentle pressure to compress the internal spring, and carefully extract the strap end. Repeat for both lugs. Install the new strap by reversing the procedure: insert one end first, compress the spring with the tool, then insert the other end. Verify that both lugs are correctly seated. If you have limited experience, it is advisable to delegate this operation to a professional watchmaker to avoid damage to the case.

Yes, any strap with a 20mm lug width is compatible with the AM901. The artisanal straps from MilanoStraps, crafted with vegetable tanning, shell cordovan, selected calf leather and natural rubber, are entirely compatible with the AM901 case. It is essential to verify that the strap thickness is appropriate (generally 2.5-3.5mm for the lugs) and that the strap's aesthetic design respects the minimalist grammar of the watch. We recommend consulting the Casati Milano atelier for personalised advice on the best choice for your usage profile.

A leather strap of quality, crafted with vegetable tanning or premium calf leather, has an average lifespan of 3-5 years with moderate daily use (5-6 days per week). Durability depends on multiple factors: frequency of use, exposure to moisture and perspiration, leather care and the strap's construction quality. A vegetable-tanned strap with natural patina tends to age visually better, developing a rich patina that conceals signs of wear. To extend lifespan, it is advisable to periodically rotate straps, occasionally apply natural protective balm, and store them in dry environments. When the strap shows critical signs of wear (cracks in the leather, structural weakening), replacement with a new compatible strap is appropriate.