Strap for Endeavour Perpetual Calendar Golden Edition

The lug width of the H. Moser & Cie Endeavour 1341-0101 is precisely 20mm. This measurement is defined as the distance between the inner edge of one lug and the inner edge of the opposite lug, calculated perpendicular to the pin axis. It is critical to respect this measurement exactly, as the integrated case of the Endeavour tolerates only very tight margins between strap and case. A significantly wider or narrower strap would cause visual gaps or restrict the natural rotation of the case on the wrist.

For the Endeavour 1341-0101 in rose gold, alligator in vegetable tanning represents the most coherent choice both aesthetically and functionally. The natural texture of alligator grain dialogues elegantly with the patina that rose gold develops over time. A valid alternative is calf leather in vegetable tanning in medium brown, bordeaux, or cognac tones. For those seeking versatility, a ballistic canvas NATO offers practicality, whilst shell cordovan remains a fascinating choice for experienced collectors, though it requires an initial break-in period.

To change the strap on a watch with 20mm lug width, you must use a specialised spring bar removal tool. Position the tip of the tool in the groove beneath the pin, exert gentle inward pressure to compress the internal spring of the pin, and simultaneously extract it from the case. Once all pins are extracted from the case ends, the previous strap can be removed. The new strap should be inserted by aligning the two lug ends with the case holes, then reinsert the pins sequentially, ensuring each is fully locked. For rose gold watches such as the 1341-0101, this operation should be performed with extreme care to avoid scratching the case.

A high-quality aftermarket strap is perfectly compatible with the 1341-0101, provided it strictly respects the 20mm lug width measurement and the constructive tolerances of the case. Artisanal straps from specialised ateliers guarantee millimetre precision superior to many branded straps, especially if custom-made. However, it is essential to verify that the strap has been specifically manufactured for 20mm lug watches; even minor tolerances (19.8mm or 20.2mm) can cause issues. Avoid inexpensive straps of dubious origin, which often disregard the watch's constructive specifications and compromise the overall aesthetic.

A high-quality leather strap (alligator, calf, or cordovan) on a wristwatch such as the 1341-0101 has an average lifespan of 3-5 years with moderate daily use. Durability depends on factors such as frequency of wear, exposure to humidity, perspiration, and UV rays. Alligator in vegetable tanning tends to last towards the upper end of this range, especially if treated periodically with specialised balms. Shell cordovan, whilst initially stiffer, develops a natural protective patina that extends its life beyond 5 years. FKM rubber offers superior longevity, up to 7-10 years, though it loses elasticity over time. The critical factor is maintenance: a strap cleaned monthly and protected from excessive moisture regularly exceeds estimated lifespans.