Strap for Richard Lange Perpetual Calendar Terraluna White Gold

The lug width of the A. Lange & Söhne Richard Lange 180.026 is 22mm. This measurement refers to the distance between the two inner pins that protrude from the case, where the strap is inserted. It is crucial to verify this dimension with millimetre precision, as straps of 21mm or 23mm would generate asymmetrical tensions on the case, compromising both aesthetics and the longevity of the insertion seats.

The best strap depends on intended use and colour preference. For formal wear, we recommend alligator in dark brown (Testa di Moro, Castaro, Mogano), whose regular texture emphasises the geometry of the perpetual calendar dial. For a patina that ages in parallel with white gold, opt for vegetable-tanned calf leather. Shell cordovan represents maximum structural compactness, ideal for ritual wear. Cotton NATO suits the austere scientific character of the German design, whilst FKM rubber provides modern water resistance.

Position the watch on a dedicated holder with the dial facing upwards. Use a spring bar tool or an extremely thin flathead screwdriver. Insert the tool beneath the inner pin of the spring mechanism, compressing the spring towards the case centre, then extract the pin from the lug holes. Repeat on the other side. Once the old strap is removed, insert the new strap pins into the lug holes and press until you hear an audible click, confirming correct closure of the spring. Do not force: the click is the signal of proper engagement.

Yes, absolutely. Any strap with a 22mm lug width is mechanically compatible with the Richard Lange 180.026. We recommend artisanal straps from manufacturers specialising in fine leathers (vegetable-tanned, alligator, shell cordovan) since the Richard Lange, being a high-complication timepiece in white gold, deserves a strap that reflects the same standards of construction quality and materials. Avoid mass-produced straps from major houses, often characterised by generic leather and superficial finishing.

The lifespan of a leather strap depends on three factors: leather type (alligator: 4-6 years with daily wear; vegetable-tanned calf: 3-5 years; shell cordovan: 5-8 years), frequency of use and maintenance care. A strap worn daily will age faster than one used ritually. The patina that forms is natural and desirable—it indicates tannin absorption and the leather's adaptation to your wrist. Casati Milano provides straps with an 18-month warranty against manufacturing defects, separate from the leather's natural wear.