A. Lange & Söhne
Lange 1 320.040— lug 20mm

The Lange 1 320.040 features a lug width of exactly 20 millimetres. This dimension is the standard for the original watch's spring bar attachments. Any aftermarket strap with a 20mm lug width will be perfectly compatible. To verify, measure the distance between the two attachment pins on the case: if it measures 20mm, the strap will fit without any issues.

For a Lange 1 320.040 in platinum, alligator leather is the most coherent choice aligned with the model's DNA. A dark brown or cognac alligator amplifies the watch's authority and creates perfect visual balance. Alternatively, vegetable-tanned calf leather offers a patina that ages gracefully over time, creating a fascinating dynamic between the static metal and the evolving peel.

Strap replacement is performed using the spring bars or straight pins that connect the strap to the case lugs. Using a dedicated spring bar tool or the thin tip of a blade, press the pin laterally to release it, remove the old strap, and insert a new one in the same position. This is a straightforward operation requiring no specialised tools, but must be executed carefully to avoid scratching the platinum case.

Yes, any strap with a 20mm lug width is fully compatible with the Lange 1 320.040. Aftermarket straps produced by artisanal manufacturers such as Casati Milano often offer superior build quality and material selection compared to factory straps. Compatibility is guaranteed by the standardisation of lug width: 20 millimetres is an internationally recognised standard.

A quality leather strap (alligator or calf) for the Lange 1 320.040 has an average lifespan of 5–8 years if worn daily, extending to 10–12 years with occasional use. Longevity depends on factors such as humidity, sun exposure, frequency of wear, and maintenance. A vegetable-tanned strap typically lasts longer and develops a fascinating patina. The 18-month warranty covers manufacturing defects but not natural wear.