Strap for Robert Mühle Auf/Ab GOLD White / Strap

The lug width of the M1-11-25-LB is precisely 18 mm. This measurement is the fundamental parameter for selecting a compatible strap. It is measured by inserting a digital calliper between the internal pins that support the strap: the distance must be 18 mm, without tolerance. A strap of different width, even 0.5 mm, will not seat correctly and risks damaging the satin-finished case.

The ideal strap depends on use and aesthetic preference. For sartorial elegance, we recommend dark brown or navy alligator with vegetable tanning: the contrast between the natural grain and the satin case creates depth. For daily practicality, NATO strap in grey tortora cotton maintains aesthetic integrity. Shell cordovan in cherry, with patina that develops over time, is excellent for those seeking a strap that tells a story. Technical rubber in black or anthracite grey offers modern comfort without visual compromise.

Position the watch on a soft surface (e.g. microfibre cloth). Using a spring bar tool (thin lever), apply gentle pressure inward on one of the lateral pins supporting the strap: the retractable pin will disengage from the internal spring. Extract the pin from the case, then the strap. Repeat from the other side. Reverse the procedure with the new strap: insert the pins into the case cavities, ensuring they click firmly. Avoid excessive force that could scratch the satin steel.

Yes, an 18 mm aftermarket strap is completely compatible with the M1-11-25-LB. Ensure the lug width is precisely 18 mm and the pins are straight and unworn. Artisanal leather straps with vegetable tanning, alligator or technical rubber integrate perfectly if constructed to high quality standards. Always verify that the strap does not have excessive thickness at the case attachment: overly thick straps may compromise fit and the aesthetic proportion of the design.

A quality leather strap, with vegetable tanning, worn daily has a lifespan of 2-4 years before requiring replacement. Factors that influence longevity: solar exposure (UV ages leather), environmental humidity, wearing frequency, personal perspiration. Vegetable-tanned leather naturally develops patina and elasticity naturally decreases. Shell cordovan, more resistant, can last 5-7 years. To extend strap life, avoid prolonged water contact, excessive humidity and direct sunlight. Periodic cleaning with a soft damp cloth and annual treatment with natural wax maintains flexibility and durability.