Mühle Glashütte · 29er

Strap for 29er Big White / Strap

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

Lug width20 mm
Case diameter42 mm
ReferenceM1-25-31-LB
Family29er
MovementMühle Glashütte caliber Mühle SW 200-1 hours, minutes, seconds | date
Year2017
CaseStainless Steel

Spring bar

Swiss Standard universal spring bars

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

Straps for the 29er M1-25-31-LB

Selected for the 20 mm lug width · workshop selection

All 20 mm straps →

The 29er M1-25-31-LB, seen from the bench

The Mühle Glashütte 29er M1-25-31-LB embodies Saxon manufacturing tradition with an uncompromising instrument watch philosophy. It features an automatic Mühle SW 200-1 caliber movement, a 42.40 mm stainless steel case with functional finishing, and a 20 mm lug width. The dial remains legible under critical visibility conditions, with proportioned details driven by practical needs rather than aesthetic excess. This watch gains respect through consistent construction and metronomic reliability.

Frequently asked questions

What is the lug width of the Mühle Glashütte 29er M1-25-31-LB?

The lug width is 20.00 mm. This dimension is the standard attachment width between the case lugs, essential for selecting compatible straps. Measure precisely the gap between the lugs: 20 mm corresponds to the internal space where the strap is seated.

Which strap is best for the Mühle Glashütte 29er?

It depends on use: for formal elegance, a vegetable-tanned calf leather with natural patina development; for durability, genuine alligator with fine, symmetrical grain; for urban versatility, a NATO in melange wool or cotton; for aquatic environments, FKM or matte silicone rubber. Each choice reflects a different interpretation of the 29er without altering its constructive identity.

How do you change the strap on this watch?

The 29er uses a standard straight bar attachment system. Remove the bars using a specific tool (strap removal tool) by pushing inward from the dial side. Insert the new strap by threading the bar through the lugs, ensuring it is fully inserted and locked. Verify that it does not protrude and that the strap is perfectly symmetrical.

Can I use an aftermarket strap on this reference?

Yes, provided the lug width is exactly 20 mm. MilanoStraps offers bespoke, handcrafted straps compatible with various finishes and materials. A quality aftermarket strap can transform the aesthetic of the 29er without compromising functionality: the case mass supports both leather and NATO straps well.

How long does a leather strap last on a wristwatch?

With moderate use and regular maintenance, a vegetable-tanned leather strap lasts approximately 2–4 years. Durability depends on climate, sweat exposure, and intensity of use. A genuine alligator strap resists 4–7 years. The natural patina that develops is a sign of controlled ageing, not deterioration. Protect from prolonged water exposure to extend useful 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