Strap for 1815 Up/Down White Gold

The lug width is precisely 20 millimetres. This measurement is specific to the 1815 case and is calculated between the internal shoulders of the case where the spring bars are fitted. It is important not to confuse this dimension with the width of the strap at the wrist, which will be slightly smaller due to the rounding of the case shoulders.

For the 234.026 in white gold, alligator is the most historically coherent choice: its regular texture emphasises the austerity of the silver dial, and the leather's lustre does not compete with the transparency of the caseback. Vegetable-tanned calf is ideal for those seeking a more tactile and natural feel. A structured rubber remains a pragmatic choice for daily wear, maintaining the aesthetic dignity of the timepiece.

The strap is changed by gently removing the spring bars using a dedicated tool (spring bar tool). The lug bars are positioned at the case shoulders; apply light pressure inward on one shoulder whilst simultaneously lifting the strap. This operation requires precision to avoid scratching the white gold case. If you are not experienced, entrust the change to a certified watchmaker.

Yes, any strap designed for a 20mm lug width is compatible with the 1815 234.026. The spring bars are universal standard components. It is essential to verify that the strap is manufactured from materials of equivalent quality: alligator, calf, and cordovan are the recommended choices to maintain aesthetic and constructive coherence with a timepiece of this calibre.

A quality alligator strap typically lasts 15–20 years with proper maintenance (avoid water immersion, periodic hydration with specific balms). A vegetable-tanned calf, being less dense, lasts 8–12 years. Durability depends on frequency of use, climate, and care: humid environments and direct sunlight accelerate deterioration. Proper storage in a cool, dry place significantly extends the life of the strap.