Strap for Kalpa Donna

The lug width is 20mm. This measurement is determined by the tonneau case geometry and the positioning of the curved lugs. It is essential to verify this dimension with a calliper before purchasing an aftermarket strap, as a measurement error compromises both the aesthetics and functionality of the combination.

Alligator leather in vegetable tanning is the most sophisticated choice: the natural grain remains uniform over time, the patina develops in parallel with the stainless steel case, and durability extends beyond 5-7 years of daily wear. Shell cordovan is also an excellent alternative for those preferring greater density. For everyday practicality, an Italian cotton-linen NATO strap offers versatility without chromatic compromise.

Use a spring bar removal tool to extract the pins from the lugs. Insert the bifurcated tip of the tool beneath the pin, gently press inward to compress the spring, and extract the pin. Position the new strap by aligning the holes with the lug shoulders, reinsert the pins ensuring they click securely at both ends. Verify that the strap is equidistant from the case before wearing the watch.

Any strap with a 20mm attachment is compatible. We recommend choosing between alligator, full-grain calf in vegetable tanning, shell cordovan, or NATO in natural materials. Avoid synthetic or PVC straps, which do not harmonize with the stainless steel case. Verify that the passant (where the strap curves around the lug) is sufficiently soft to follow the tonneau curvature without rigidity.

An alligator or full-grain calf in vegetable tanning, worn daily and subject to regular maintenance (cleaning with a damp cloth, applying protective balm every 6 months), typically lasts 5-7 years. Shell cordovan, being denser, can extend to 7-10 years. Longevity depends on exposure to moisture, heat, and frequency of wear. A strap worn 2-3 times weekly lasts significantly longer than continuous daily use.