Strap for Master Collection Date 29 Two Tone

The Longines Master Collection L2.257.5.37.7 features a lug width of 15mm. This measurement is taken between the internal lugs of the case and represents the exact distance at which the strap must fit to ensure proper wear without slipping or misalignment. Measurement is performed using a digital calliper positioned perpendicularly to the case lugs.

For this two-tone model in stainless steel and yellow gold, straps in alligator with cognac or medium brown tones, vegetable-tanned calf leather in dark brown or black, or shell cordovan in burgundy are ideal. A black leather strap of superior quality with a deployante clasp offers elegant restraint. In dynamic contexts, a perforated black rubber strap also maintains aesthetic harmony. The choice should favour colours that do not visually compete with the two-tone case.

Strap replacement requires the use of a spring bar tool. Position the tool on the internal spring of the upper lug attachment, applying gentle downward pressure to disengage the spring, then carefully extract the pin. Repeat the operation on the lower lug. Insert the new strap by aligning it with the lugs and push the pin until the spring engages. It is advisable to entrust the operation to a professional watchmaker to avoid scratching the two-tone case.

Yes, aftermarket straps can be used provided the lug width is precisely 15mm. Milano Straps offers a collection of artisanal leather straps compatible with the model, all custom-made to ensure perfect fit. The Casati Milano atelier personalises each strap with choice of leather, stitching and thread colour according to client preference, maintaining an 18-month warranty.

Leather strap longevity depends on leather quality, frequency of use and maintenance. A strap in alligator or vegetable-tanned calf, if subject to minimal maintenance (periodic cleaning, avoiding prolonged moisture), can last 5-7 years with daily use. A shell cordovan strap, thanks to its density and structure, can extend durability to 8-10 years. The patina that develops naturally imparts character to the strap. Milano Straps offers restoration and regeneration services for worn straps.