A. Lange & Söhne · Lange 1

Strap for Kleine Lange 1 Pink Gold / Brown

Takes 19 mm straps. Verified lug width, the straps that fit this model, and answers to the most common questions.

Lug width19 mm
Case diameter37 mm
Reference181.037 (aka: 181037)
FamilyLange 1
MovementA. Lange & Söhne caliber L121.1 hours, minutes, small seconds | big date | power reserve indicator
Year2018
CaseRose Gold

Spring bar

Swiss Standard universal spring bars

The right category for this model · 316L steel, all lug widths 13–26 mm

Straps for the Lange 1 181.037 (aka: 181037)

Selected for the 19 mm lug width · workshop selection

All 19 mm straps →

The Lange 1 181.037 (aka: 181037), seen from the bench

The Lange 1 represents the flagship model of A. Lange & Söhne, characterized by the asymmetrical layout of the dial with a large date and power reserve indicator. It is equipped with the in-house manufactured caliber L121.1 hand-wound movement with functions of hours, minutes, small seconds, large date and power reserve indicator. The case features 19mm lugs.

Frequently asked questions

What is the lug width of the A. Lange & Söhne Lange 1 181.037?

The lug width of the A. Lange & Söhne Lange 1 181.037 is 19.00 mm. This standard measurement ensures compatibility with aftermarket straps specifically designed for this collection. To verify your current strap's measurement, place a metal ruler on the inner face of the lug, measuring from wall to wall of the keeper.

What is the best strap material for the Lange 1 181.037?

Alligator leather represents the most elegant and sophisticated choice: its natural grain pattern dialogues perfectly with the rose gold's lustre without competing with the dial. For a pronounced texture and a patina that develops over time, vegetable-tanned calfskin offers increasing character. Shell cordovan is ideal for those who appreciate tactile fullness and intrinsic shine. For versatile wear, a cotton-nylon NATO guarantees practicality while maintaining elegance.

How do I change the strap on an A. Lange & Söhne Lange 1 181.037?

Strap replacement requires a dedicated spring bar tool. Position the watch on a soft surface (microfibre cloth), insert the tool's tip into the small aperture on the inner lug shoulder, apply gentle pressure until the spring releases, then extract the strap. Install the new strap by inserting the spring first on one side, then the other. Avoid forcing: the Lange 1's construction precision demands delicate movements.

Can I use an aftermarket strap on my Lange 1 181.037?

Yes, you can use aftermarket straps compatible with the 19 mm lug width. We recommend selecting high-quality materials (alligator, calfskin, shell cordovan) that reflect the watch's constructive refinement. A bespoke strap crafted to measure ensures perfect fit and decade-long durability, preserving the piece's aesthetic and functional value.

How long does a leather strap last on an A. Lange & Söhne Lange 1 181.037?

A leather strap's lifespan depends on frequency of wear, care, and material. Premium alligator with vegetable tanning maintains structural integrity for 8-15 years with moderate use (3-4 days per week). Shell cordovan and vegetable-tanned calfskin offer similar longevity. Proper conservation—avoiding excessive moisture, drying after water exposure, and gently operating the deployant clasp—significantly extends the strap's life.

The next step

The right strap isn't chosen. It is built, together.

From the atelier appointment to delivery, every step is made for those who know that things done well take time. Rare leathers, one piece at a time, eighteen months of warranty.

Request an appointment →

Casati Milano · Via XX Settembre 15, Milan · by appointment only