Strap for Senator Perpetual Calendar Stainless Steel / Silver / Rubber / Folding

The lug width of the 100-02-22-12-04 is precisely 18mm. This measurement indicates the distance between the two lugs (attachment points) of the case: to verify, insert a measuring tape or digital calliper between the lugs, measuring from inside to inside. Do not confuse the lug width with the visible width of an already-mounted strap: 18mm is the only relevant dimension when purchasing a compatible strap.

For the steel Senator 100-02-22-12-04, we recommend alligator straps with vegetable tanning (formal elegance), shell cordovan aged by hand (elegant with outstanding patina development), or fine-grain calf leather. For dynamic usage, quality cordura NATO or FKM rubber maintain elegance without compromising practicality. We advise against inexpensive synthetic materials: the sophisticated in-house movement deserves straps built with equal artisanal rigour.

Strap replacement on a Senator requires a precision spring bar tool or dedicated extraction lever to release the lug pins from their seats. We strongly recommend entrusting this operation to a professional watchmaker: the lug pins of the 100-02-22-12-04 are steel and their case holes are toleranced with precision. Incorrect handling risks scuffing the lugs or damaging the pins. For professional support or strap-change service, Casati Milano offers consultation by appointment.

Yes, any commercially available strap with a declared lug width of 18mm is compatible with the 100-02-22-12-04. However, we recommend selecting specialised strap makers guaranteeing noble materials (alligator, shell cordovan, fine-grain calf) and construction finishes coherent with your Senator's sophistication. Milan Straps offer quality craftsmanship with multiple customisable configurations.

A quality leather strap (alligator, cordovan, calf) mounted on a Senator 100-02-22-12-04 lasts an average of 3–5 years with daily wear, provided periodic maintenance is performed: gentle drying if exposed to moisture, natural balm application every 6–12 months to preserve flexibility, and protection from prolonged exposure to salt sweat or extreme humidity. Natural patina development in leather is desirable and not a sign of degradation, but aesthetic ageing. FKM rubber or NATO straps have superior longevity (5–10 years) with minimal maintenance requirements.