Strap for Senator Excellence Perpetual Calendar Stainless Steel / Silver / Alligator / Folding

The lug width of the Senator 1-36-02-01-02-50 is 21mm. This dimension is determined by the proportional construction of the 42mm case and must be verified by positioning a digital calliper perpendicular to the lugs: the measured value corresponds to the internal width of the tube that accommodates the strap, not the external circumference of the metal bar.

The ideal strap depends on daily usage. Alligator leather with vegetable tanning represents the most refined choice, developing an evolved patina over time and offering superior moisture resistance. Vegetable-tanned calf is recommended for those preferring accelerated natural ageing. For sporting environments or summer seasons, NATO or rubber straps provide versatility without compromising mechanical integrity.

The procedure requires extraction of the lateral case pins using a dedicated tool (spring bar tool) equipped with a bifid spatula. Support the case gently with one hand, press the spatula against the pin spring to compress it, and slide the pin out of the lug. Operate carefully to avoid scratching the case. Once the pin is removed, take off the old strap and insert the new one, aligning it correctly on both holes.

Yes, provided the strap is specifically calibrated for the 21mm lug width, full compatibility is guaranteed. We recommend straps crafted with vegetable-tanned or alligator leather, as construction quality and thickness control preserve the aesthetic and mechanical value of the timepiece. Avoid generic straps that do not respect dimensional tolerances.

A vegetable-tanned calf or alligator leather strap with vegetable tanning has an average lifespan of 5-7 years under moderate use conditions, subject to variables such as ambient humidity, direct sun exposure, and frequency of wear. Stitching with natural waxed thread remains resilient over time if subjected to periodic maintenance (gentle cleaning with a damp cloth). Rubber or NATO textile straps have superior durability (10+ years), but still require periodic buckle replacement.