Strap for Lange 1A Gold Guilloche

The A. Lange & Söhne Lange 1 (ref. 112.021) features a lug width of 20 mm. This dimension is measured between the inner edges of the lugs and represents a harmonic proportion with the 38.50 mm case diameter according to Glashütte construction principles. When sourcing a compatible strap, ensure you measure the lugs to this standard for precise fit.

For the Lange 1 112.021 in 18k yellow gold, we recommend African alligator (niloticus) with fine grain and natural patina that develops with wear. Shell cordovan in burgundy or dark chocolate tones is an excellent alternative: this horsehide possesses high density and intrinsic luminosity that harmonises with the nobility of gold. A calf leather with vegetable tanning in dark brown represents the versatile choice for daily wear with elegant ageing characteristics.

The strap on the Lange 1 112.021 is replaced by removing the suspension pins (lug bars) using a dedicated tool (spring bar tool). Gently prise the internal spring of the pin, slide out the bar and old strap, then position the new strap and reinsert the pin until the locking click engages. If inexperienced, have the operation performed by an authorised service centre to avoid case damage.

Yes, provided it strictly adheres to the 20 mm lug width and features passants (lateral loops) dimensioned for this specific width. Bespoke artisanal straps represent the optimal solution: they allow selection of material (alligator, shell cordovan, vegetable-tanned calf) and finish, ensuring complete compatibility and construction quality befitting the watch. Avoid generic straps that may not fit properly.

Leather strap longevity depends on daily wear, material choice and climate conditions. Quality alligator or vegetable-tanned shell cordovan will last 4–6 years with moderate daily use. Robust vegetable-tanned calf can reach 5–7 years. Exposure to humidity, heat and perspiration accelerates ageing. A strap constructed with a yellow gold buckle (matching the case) ensures aesthetic coherence and durability of the closure mechanism over time.