A. Lange & Söhne
Lange 1 101.325— lug 20mm

The lug width of the A. Lange & Söhne Lange 1 101.325 is 20 millimetres. This measurement is determined by the geometry of the platinum case and represents the space between the articulation pins of the case itself. Correct measurement is taken by placing a calliper from the centre of the upper pin to the centre of the lower pin. Only straps with exactly 20mm lug width will guarantee perfect compatibility and stability on the wrist.

For the Lange 1 101.325 in platinum, alligator with vegetable tanning represents the most aesthetically and functionally appropriate choice. The regular texture of alligator creates a controlled lustre contrast with the platinum, without eclipsing the noble metal of the case. Alternatively, shell cordovan develops a profound patina over time, or vegetable-tanned calf offers tactile compactness and controlled rigidity that supports the weight of the case.

Changing the strap on the Lange 1 101.325 requires a precision spring bar tool to extract the articulation pins. Position the watch with the case facing upwards, gently insert the tip of the tool into the lateral hole of the upper pin and extract with a smooth outward motion. Repeat for the lower pin. Once both pins are extracted, the old strap/bracelet separates from the case. Insert the new 20mm strap by aligning the internal holes with the pins, and reinsert the pins using the same precision tool. If you are not experienced, entrust the operation to a qualified watchmaker to avoid damage to the platinum pins.

Yes, it is possible to fit an aftermarket strap to the Lange 1 101.325, provided the lug width is exactly 20 millimetres. Avoid undersized straps (19mm) that do not provide stability, and oversized ones (21mm) that create gaps along the lug channel. A bespoke leather strap made with noble materials such as alligator or shell cordovan represents the ideal upgrade from the original strap, allowing you to personalise the expression of the watch whilst maintaining mechanical compatibility and reliability.

The lifespan of a leather strap on the Lange 1 101.325 depends on the quality of the leather, frequency of use and environmental conditions. A high-quality alligator or shell cordovan strap typically lasts 3–5 years with daily wear. Vegetable-tanned calf tends to last slightly less (2–4 years) due to its greater softness. Frequent exposure to moisture, direct sunlight and extreme temperatures accelerates ageing. An artisanal strap with a warranty on manufacturing defects offers greater reliability. Regular maintenance – hydration with specific creams and protection from elements – significantly extends the useful life of the strap.