Strap for Legacy Machine LM101 Moser Cosmic Green

The lug width of the MB&F Legacy Machines 51.SL.MG is 20 millimetres. This is the distance between the inner edges of the metal spring bars that attach the strap to the case. To verify this measurement, simply remove the current strap and measure the distance between the two spring bars. Compatible straps must have an exact width of 20 millimetres to ensure a precise and secure fit.

We recommend a vegetable-tanned alligator strap for the Legacy Machines 51.SL.MG, as it dialogues elegantly with the satinised stainless steel case finish and develops a beautiful patina over time. Alternatively, a vegetable-tanned calf strap offers a more discreet surface, whilst a synthetic NATO strap creates a modern and bold contrast. Technical rubber is ideal if you seek a water-resistant and minimalist alternative.

To change the strap on the 51.SL.MG, you must remove the metal spring bars using a dedicated spring bar tool. Extract one spring bar from the inside of the case, disconnect the old strap, insert the spring bar through the lug of the new strap, and reinsert the spring bar into the case until it clicks. Repeat on the opposite side. If you are inexperienced, we recommend consulting a professional watchmaker to avoid damaging the case.

Yes, any aftermarket strap with a 20-millimetre lug width is compatible with the Legacy Machines 51.SL.MG. However, we recommend selecting straps of elevated construction quality, crafted from noble materials such as alligator, calf, or technical rubber, to ensure aesthetic synergy with the watch's sophistication. The lugs must be well-structured and the finishing precise, elements that guarantee longevity.

The lifespan of a leather strap depends on intensity of use, tanning method, and construction quality. An alligator or calf strap with vegetable tanning, worn moderately (4–5 days per week), typically lasts 3–5 years before replacement is necessary. Vegetable-tanned leather develops a fine patina over time, enhancing aesthetics. Prolonged exposure to moisture, perspiration, and direct sunlight reduces lifespan. To extend strap life, we recommend rotating with alternative straps and cleaning regularly with a slightly damp cloth.