Strap for Promare Lady Mother of Pearl / Bracelet

The lug width of the M1-42-25-MB is 20 millimetres. This measurement defines the distance between the two lugs of the case and determines compatibility with aftermarket straps. A 20mm strap will fit precisely to the case without tension or instability.

The choice of strap depends on intended use and aesthetic preference. For formal elegance, alligator with vegetable tanning offers patina and sophistication. For daily robustness, vegetable-tanned calf leather ensures durability and visible ageing. For instrumental practicality, cotton NATO or FKM rubber provides resistance and easy replacement.

To change the strap, a professional tool called a spring bar tool is required. Insert the tool's tip into the lug hole, compress the suspension pin (spring bar), and extract the old strap. Once the pin is released, insert the new strap ensuring the pin is fully engaged. For professional results, consult a specialist atelier such as Casati Milano.

All straps with a 20-millimetre lug width are compatible with the M1-42-25-MB. On milanostraps.it you will find a curated selection of artisanal solutions in alligator, vegetable-tanned calf, cotton NATO, synthetic silk, and FKM rubber. Each strap is available in various shades and can be customised online before purchase.

An alligator or vegetable-tanned calf strap has an expected lifespan of 4–7 years with daily use, provided regular maintenance is observed (cleaning, occasional conditioning, and drying after moisture exposure). Natural leather develops characteristic patina that increases aesthetic value over time. A rubber or NATO strap lasts 5–10 years, with degradation primarily from UV exposure rather than structural wear.