Strap for BC4 Small Second Pointer Day Stainless Steel / Black / Bracelet

The lug width is 22mm, measured from the inner shoulder of one lug to the other. This width is standard for chronographs in this category. To verify it, remove the current strap and measure the distance between the two spring bars that attach the strap to the case.

It depends on usage. For formal professional wear, we recommend alligator with vegetable tanning for both elegance and durability. For sports and travel, a robust NATO offers absolute reliability. Vulcanised rubber is ideal if the chronograph is used in humid environments or high-activity conditions. Calf leather is the choice for those who appreciate natural ageing.

Use a spring bar tool (fork-shaped tool): insert the fork under the spring bar with slight pressure, creating space to extract the pin from its seat. Repeat on the other side. Insert the new spring bars into the craft strap, align the holes and press gently until the spring bars find their seats in the case lugs. Verify that the pins are fully locked in place.

Yes, any strap made for 22mm lug width is compatible, provided the spring bars are the correct diameter (typically 1.80mm for this model). Choose straps from specialised manufacturers that respect construction tolerances. Certified artisan straps guarantee perfect mechanical compatibility.

A quality leather strap (alligator, calf with vegetable tanning) lasts 4-7 years with moderate daily use. Lifespan varies based on UV exposure, humidity and mechanical stress on the buckle. With proper maintenance—conditioning every 18-24 months and monthly cleaning—you can extend the strap's life. NATO straps last significantly longer (8-10 years) as nylon resists oxidation better.