Strap for TT1 Day Date Stainless Steel / Black / Rubber

The lug width is precisely 24 millimetres. This specification represents a rarified standard in watchmaking and requires bespoke straps or certified artisanal quality. Always measure with a digital calliper from the inner shoulder of the case to the opposite inner shoulder to verify compatibility of any third-party strap.

The choice depends on intended use and aesthetic preference. For pure technical vocality, vulcanised rubber or grey ballistic NATO fabric preserve instrumental authenticity. For restrained elegance, vegetable-tanned calf or natural alligator are excellent options. Vegetable-tanned calf in particular ages nobly, developing unique patina over time that amplifies the sensorial value of the timepiece.

Remove the existing strap using a spring bar removal tool. Locate the small lateral holes on the case corresponding to the lug attachments. Insert the spring bar tool into the hole, compressing the internal spring mechanism, and gently lift the strap downward. Repeat on the opposite side. When installing the new 24mm strap, ensure uniform spring compression before seating the pins into the case sockets.

Yes, provided it is certified for 24mm lug width. However, we recommend bespoke straps manufactured to rigid construction tolerances: half-millimetre variations in width will produce suboptimal fit and risk lateral case movement. Artisanal straps of superior quality guarantee geometric precision aligned with Swiss manufacturing standards.

A calf strap with vegetable tanning or natural alligator maintains structural integrity for 3-5 years of daily wear, with variation dependent on solar exposure, ambient humidity, and bodily perspiration. Actual longevity increases with periodic maintenance: cleaning with damp cloth, occasional application of neutral balm, and storage in dry environment when unworn. Vulcanised rubber, by contrast, guarantees durability exceeding 7-10 years with consistent chemical resistance.