Strap for 29er Big White / Bracelet

The lug width (misura ansa) of the M1-25-31-MB is 20 mm. This measurement corresponds to the internal space between the case lugs and is the critical dimension for selecting a compatible strap. On this case diameter (42.40 mm), 20 mm ensures optimal proportions and correct aesthetic integration of the strap.

The ideal strap for the 29er M1-25-31-MB is alligator with vegetable tanning, which naturally complements the faceted case geometry. Alternatively, shell cordovan with evolving patina, structured calf leather, or technical NATO in robust fabric. Recommended colours are black, dark brown, cognac, or tobacco to avoid competing with the dial.

To change the strap: 1) Obtain a quality spring bar tool. 2) Position the watch on a flat surface with lugs facing upward. 3) Carefully insert the tool into the gap between the lug and strap, pushing the internal pin downward. 4) When the pin releases, carefully remove the old strap. 5) Align the new strap with the pin and press into position until you hear/feel the click. Avoid excessive force to prevent case damage.

Yes, all straps in the 20mm collection from milanostraps.it are specifically designed to fit the Mühle Glashütte 29er M1-25-31-MB perfectly. Each strap is hand-crafted with 20 mm internal lug width. We recommend verifying total strap length (wrist + open lug length) to ensure personalised comfort.

A quality, hand-crafted leather strap has an average lifespan of 3–5 years with daily use. Durability varies depending on: climate and humidity, washing frequency, direct sun exposure, and tanning type (vegetable tanning typically outlasts chrome tanning). Shell cordovan straps generally last longer (4–7 years) due to fibre density. Regular maintenance (gentle cleaning, proper drying, occasional natural wax treatment) significantly extends the usable life.