Strap for Lange 1 Tourbillon Perpetual Calendar 25th Anniversary

The lug width of the A. Lange & Söhne Lange 1 ref. 722.066 is precisely 20 mm. This dimension is determined by the proportions of the case (38.50 mm diameter) and the geometry of the lugs in white gold. To verify compatibility, measure the internal space between the lugs with a calliper, positioning the tool perpendicular to the lugs. No variation is tolerated by Glashütte's constructive specifications.

Dark brown alligator represents the dominant choice: the natural texture of the scales corresponds with the clean lines of the asymmetrical case, whilst the restrained luminosity amplifies the satinised finish of white gold. Shell Cordovan is an authoritative alternative, appreciated for its superior density and natural patina acquisition over time. Vegetable-tanned calf leather remains ideal for those seeking a living tactile sensation and superior breathability. Connoisseurs also seek dark burgundy alligator, the historical colour of premium German manufacture.

Changing the strap on an A. Lange & Söhne Lange 1 requires caution with the white gold case. Use a non-serrated spring bar tool (brass or plastic) to avoid scratching. Position the watch on a soft base (cloth or leather support), then insert the tool from inside the lower lug, gently pushing the pin through the lugs. Repeat symmetrically on the other side. Never force: the pins are constructed from steel with precise tolerances. If inexperienced, entrust the task to an authorised Lange service centre.

Yes, any strap with a 20 mm lug width is mechanically compatible. However, aesthetic compatibility requires attention: the strap width (the linear development visible on the wrist) must maintain proportions coherent with the 38.50 mm case and the asymmetrical quadrant geometry. Excessively thick straps (exceeding 4 mm initial thickness) may alter the drape on the lug. We recommend alligator or Shell Cordovan with maximum thickness of 3.5 mm at the base and progressive thinning towards the free edge.

A quality alligator strap (vegetable or chrome-tanned) maintains structural integrity for 4–6 years of regular wear (3–4 days weekly), independent of climatic environment. Shell Cordovan, for its greater density, can extend this interval to 7–8 years. Vegetable-tanned calf requires more frequent maintenance (conditioning every six months) and is subject to accelerated ageing in high-humidity environments. The buckle (or deployant) rarely requires replacement if constructed from solid white gold. We recommend rotating among at least three straps to limit continuous exposure to body salts.