Strap for Senator Chronometer Regulator Red Gold / Silver / Alligator / Pin

The lug width of the Senator 1-58-04-04-05-01 is 21mm. This dimension is measured as the internal distance between the two lugs in 18k red gold that connect the case to the strap. To verify this measurement, use a digital calliper and measure between the two internal holes of the lug. This specification is derived from the 42mm case proportions and ensures compatibility with any 21mm strap available on the market.

For the red gold Senator, we recommend genuine alligator leather in cognac brown tone, which creates natural chromatic consonance with the warm hue of red gold. Shell cordovan in burgundy offers an alternative luxury choice with progressive patina development. For daily versatility, superior calf leather with vegetable tanning guarantees characteristic patina over time. Your climate choice matters: in humid or very hot environments, consider FKM rubber for superior dimensional stability.

Changing the strap on the Senator requires a professional and delicate lug removal procedure. Use a strap removal tool with PTFE-coated tips to avoid damaging the red gold lugs. Position the watch on a leather pad, gently push from one lug to extract it completely, then repeat on the opposite side. Ensure the new strap has correct dimensions (21mm lug width). If you lack experience, consult a certified watchmaker or contact Casati Milano's bespoke service for professional craftsmanship.

Yes, any 21mm strap is compatible with the Senator 1-58-04-04-05-01. Artisanal Milan-made straps offer construction quality equivalent to original factory straps, with the advantage of selecting premium materials (alligator, cordovan, vegetable-tanned calf) and customising colour. Verify that the new strap's lugs have adequate thickness for the red gold spring bar carrier, and that the buckle is proportioned to the case dimensions.

Durability depends on material type and usage frequency. A quality alligator strap with vegetable tanning lasts 5-8 years in daily use, developing increasingly characteristic patina. Shell cordovan resists 6-10 years due to superior material density. Vegetable-tanned calf, with regular maintenance (biannual application of specialist balm), reaches 4-6 years. All these timeframes extend significantly if you rotate multiple straps. FKM rubber maintains functionality for 3-4 years before elasticity diminishes, regardless of frequent use.