A. Lange & Söhne · Lange 1

Strap for Lange 1 Daymatic Platinum

Takes 20 mm straps. Verified lug width, the straps that fit this model, and answers to the most common questions.

Lug width20 mm
Case diameter40 mm
Reference320.025
FamilyLange 1
MovementA. Lange & Söhne caliber L021.1 hours, minutes, small seconds | big date, day
Year2010
CasePlatinum

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 1 320.025

Selected for the 20 mm lug width · workshop selection

All 20 mm straps →

The Lange 1 320.025, seen from the bench

The Lange 1 Daymatic Platinum model 320.025 represents Saxon haute horlogerie with its iconic asymmetrical geometry in a 39.50mm platinum 950 case. Powered by the manual-wound L021.1 caliber featuring a patented decimal column regulator and 21,600 oscillations per hour, it displays hours, minutes, small seconds, date, and day of week. The 20mm lug width is essential to the case's visual balance and proportions.

Frequently asked questions

What is the lug width of the A. Lange & Söhne Lange 1 320.025?

The Lange 1 320.025 in platinum has a lug width of 20 millimetres. This dimension is determined by the geometry of the 39.50mm case and preserves the visual balance characteristic of Walter Lange's asymmetrical design. Always verify the distance between the metal lugs with callipers to avoid measurement errors.

What is the best strap for the A. Lange & Söhne Lange 1 platinum 320.025?

Alligator or shell cordovan are the materials most coherent with the aesthetic identity of this watch. Natural alligator with vegetable tanning offers a granular texture that harmonises beautifully with platinum; shell cordovan, with its natural patina ranging from mahogany to burgundy, creates sophisticated visual dialogue. Calf leather is a valid alternative for those preferring formal aesthetics. We recommend avoiding NATO and rubber straps, which contradict the constructive awareness of this piece.

How do I change the strap on the Lange 1 320.025?

Remove the watch from your wrist and place it face-down on a soft cloth. Locate the two metal lugs protruding from the strap bars—these are small metal pins. Using an appropriate tool (the tip of a small knife or dedicated strap tool), apply gentle pressure to push the pin towards the case centre until it comes free completely. Repeat on the other side. Once both old strap ends are liberated, insert the new strap's lugs into the same holes, ensuring the dial faces upward. Verify that the strap is secure before wearing.

Are aftermarket straps compatible with the 320.025?

Yes, provided the lug width is exactly 20 millimetres. Any strap equipped with 20mm lugs is mechanically compatible with the Lange 1 platinum. However, mechanical compatibility does not equal aesthetic coherence: we recommend materials of exceptional quality (alligator, shell cordovan, calf leather) with hand-finishing and artisanal construction, to honour the manufacturing excellence of the watch itself.

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

A high-quality leather strap (alligator, calf, shell cordovan) with vegetable tanning lasts approximately 5-8 years with daily wear, subject to variables such as climate, frequency of use and maintenance care. Leather naturally perspires, accelerating ageing in humid climates. We recommend periodic cleaning with a soft cloth and allowing the strap to rest for 2-3 days after intensive summer use. An 18-month warranty against manufacturing defects is industry standard in artisanal production.

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.

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