A. Lange & Söhne
Lange 1 109.025— lug 20mm

The A. Lange & Söhne Lange 1 reference 109.025 is fitted with a strap featuring 20mm lugs. This measurement refers to the internal width between the two lugs of the platinum case, where the strap is inserted. To verify it with precision, it is advisable to use a digital caliper positioned between the lugs at the lower part of the case.

For a 950 platinum case like the Lange 1 109.025, Mississippi alligator straps with fine grain are the choice for formal occasions, thanks to the natural texture that harmonizes with the dial's complexity. Box-calf veal in midnight blue or slate offers instead a contemporary pairing of great elegance. In both cases, the ideal closure is a tang buckle or deployant in platinum or white gold with 18mm width.

The strap of the Lange 1 109.025 is attached to the case via standard 20mm spring bars. To replace it, simply use a spring bar tool — a fine-pointed instrument — to compress the spring bars and remove them from the lug holes. The operation is delicate on a platinum case: it is recommended to protect the lugs with PTFE tape or entrust the task to a watchmaker or the Casati Milano atelier to avoid scratches on the precious metal.

Yes. The Lange 1 109.025 uses standard 20mm spring bars, the same size as numerous high-end watchmaking references. Quality aftermarket straps produced by Milano Straps and the Casati Milano atelier are fully compatible, made with selected leather and dimensioned with precision to ensure correct insertion in the lug without forcing, preserving the integrity of the platinum lugs.

The lifespan of a leather strap depends on the material, maintenance, and intensity of use. A quality alligator strap, with regular use and appropriate care — avoiding prolonged contact with water and sweat — has an average lifespan of 2-4 years before the leather shows significant wear in the flex zones. Box-calf veal tends to develop a characteristic patina over time, a sign of noble aging. Casati Milano straps are covered by an 18-month warranty for manufacturing defects.