Strap for Horological Machine N°3 JWLRYMACHINE Purple

The lug width of the MB&F Horological Machines 33.WATL.B is 20mm. This measurement represents the distance between the two spring bars that protrude from the case and fit into the strap lugs. It is essential to verify this compatibility before purchasing an aftermarket strap, as 20mm is the specific standard for this model.

The best strap depends on your intended use and personal aesthetic preference. For a formal approach, we recommend black or dark brown alligator with vegetable tanning. For those seeking a characterised texture, shell cordovan offers natural patina and restrained lustre. To honour the radical philosophy of the Horological Machines, a rubber or gum strap represents the most coherent choice. All our 20mm straps are compatible with this lug width.

To change the strap, you must remove the spring bars (the small elements connecting the strap to the case). Using a spring bar tool, gently press inward to release the spring bar from the lug hole, then repeat on both sides. Insert the new strap by threading the spring bars into the holes until they click into place. Do not force the bars: they should insert with moderate pressure. If you are uncertain, consult a professional watchmaker.

Yes, you can use aftermarket straps provided they respect the 20mm lug width specification. Milano Straps offers a complete collection of artisanal straps in various finishes—alligator, vegetable-tanned leather, NATO, rubber—all compatible with this width. For a bespoke result, Casati Milano (atelier by appointment) creates custom straps personalised to your case's specific proportions.

A high-quality artisanal strap with vegetable tanning typically lasts 3–5 years with regular daily wear. Longevity depends on usage frequency, moisture exposure, and maintenance. More robust leathers such as shell cordovan tend to last longer. Rubber or gum straps have similar durability but are less susceptible to moisture. We recommend rotating between two or three straps to reduce overall wear and extend lifespan.