Strap for HM Perpetual Moon

The lug width of the 1GLAR.I01A.C122A is 20mm. This dimension is determined by the proportional relationship between the 42mm case diameter and the overall architecture of the timepiece. To verify strap compatibility, measure the distance between the two spring bars (the elements that insert into the case lugs): the value must correspond precisely to 20mm.

For this rose gold model, we primarily recommend black alligator, which enhances the nobility of the case without visual competition. Shell cordovan represents an extraordinary alternative, developing a patina that elegantly dialogues with the natural ageing of rose gold. Calf leather with vegetable tanning is excellent for those who appreciate vintage aesthetics: it generates chromatic warmth and deep patina. Navy or black NATO straps function as a contemporary choice for sophisticated daily wear.

Strap replacement occurs by retracting the spring bars from one of the two case lugs. Position the watch on a soft cloth to prevent scratches. Insert a small tool (spring bar tool) into the gap between the case and the bar, apply gentle downward pressure, and the bar will retract. Remove the bar from the lug and take off the previous strap. Insert the new strap, reinsert the bar into the opposite lug, and ensure it is fully locked. Repeat for the other side. If you prefer to avoid DIY, Atelier Casati Milano offers this service by appointment.

Yes, all straps with a 20mm lug width are compatible with the 1GLAR.I01A.C122A, regardless of the manufacturer. Compatibility depends solely on lug width, not on the watch brand. Milano Straps offers an exclusive collection of artisanal 20mm straps in various finishes and materials: from alligator to calf, from NATO to rubber, crafted by specialised manufacturers. Construction quality and material ensure sensorial and durability equivalent to original straps, with the advantage of aesthetic customisation.

Lifespan depends on usage, leather quality, and tanning type. An alligator strap of excellent craftsmanship can last 5-8 years with daily use, thanks to fibre robustness. Shell cordovan, though more delicate, achieves 6-7 years if protected from moisture and direct sunlight. Calf leather with vegetable tanning varies between 3-5 years depending on frequency of use and atmospheric exposure. Rubber is more resistant (8-10 years), but leather maintains the sensorial quality that gives the wrist a particular distinction. Ageing does not represent wear in a negative sense: the patina that develops adds character and authenticity to the timepiece.