A. Lange & Söhne
Lange 1 117.035— lug 20mm

The A. Lange & Söhne Lange 1 117.035 features a lug width of precisely 20 millimetres. This specification is critical for this model and must be respected with precision: a 19mm strap will rattle, whilst a 21mm strap will not fit into the spring bar tubes. Measure by positioning the calliper at the case lug, from the inner wall of one tube to the other.

Alligator leather represents the natural choice for the 117.035. A fine-grained alligator strap in deep black or aged cognac brown pairs impeccably with the satin-finished platinum, without competing visually. Alternatively, high-quality calf leather with vegetable tanning or cordovan offer complementary textures. Synthetic straps are discouraged: the Lange 1 deserves living materials capable of patination and character development over time.

Strap replacement requires no specialist skills, but meticulous attention. Procure a spring bar tool, position the watch on a soft surface to prevent scratches, then gently depress the spring from one side using the bifurcated tool. Repeat on the other side. Insert the new strap, aligning the spring bar tubes into their housings, then press until you hear the click of engagement. Tolerance is minimal: excessive pressure risks bending the spring.

Yes, provided they respect the 20mm lug width specification. Quality artisanal straps (such as Casati Milano productions) are fully compatible and often exceed OEM options in character and longevity. Always verify that the strap has been measured with precision: a tolerance of ±0.5mm represents the maximum acceptable variance. Avoid generic straps from unspecialised e-commerce platforms.

A high-quality alligator or calf strap, properly maintained, typically lasts 5-7 years under daily wear. Longevity depends on frequency of use, ambient humidity, and maintenance (regularly clean with soft cloth, avoid prolonged exposure to water and excessive perspiration). Cordovan can exceed 10 years. The tanning method (vegetable versus industrial) significantly influences wear resistance.