Strap for Legacy Machine FlyingT Yellow Gold / Onyx

The lug width of the MB&F Legacy Machines 05.YL.ON is precisely 20 millimetres. This specific dimension was chosen by Max Büsser to maintain balanced proportions between the 38.50 millimetre case and the strap, echoing vintage horological architectures from the 1960s. To verify compatibility of an aftermarket strap, measure the internal distance between the lugs from the spring bar base on one side to the base on the opposite side: it must correspond exactly to 20 millimetres.

For the 05.YL.ON, alligator is the natural choice. The irregular texture of the ventral scutes creates a noble aesthetic contrast against the satin-finished yellow gold surface, generating a dialogue between geometric order and biological chaos. Alternatively, vegetable-tanned calf leather ensures a patina that matures over time, whilst NATO straps in neutral canvas (anthracite black, slate grey) introduce a contemporary element. FKM rubber remains a radical choice reserved for collectors who wish to emphasise constructive resilience over elegance.

Changing the strap on the 05.YL.ON requires extreme care given the delicate nature of the yellow gold case. Use a professional-grade spring bar remover, inserting the bifurcated tip into the gap between the lug and the return spring. Gently push downwards until the spring tension releases, then slide the old strap out of the lug. Always verify that the new strap has a maximum width of 20 millimetres at the attachment point to avoid lateral play that would compromise the assembly. If inexperienced, consult a specialist watchmaker or contact Casati Milano directly for professional replacement.

Yes, high-quality aftermarket straps compatible with the 20-millimetre lug width of the 05.YL.ON are available. The Milano Straps collection offers options in alligator, vegetable-tanned calf, NATO and rubber, all sized specifically for this width. Each strap is factory-controlled to guarantee mechanical compatibility and aesthetic proportion. Before purchase, always verify that the strap passant is suitable for 20 millimetres: an oversized lug would force the passant to bend unnaturally, compromising the structural integrity of your masterpiece.

A leather strap on a regularly worn timepiece has an average lifespan of 2-4 years, though much depends on usage intensity, moisture exposure and tanning method. Alligator leather with vegetable tanning, if properly maintained, develops a noble patina that extends its aesthetic vitality to 5-6 years. To preserve longevity, avoid wearing the 05.YL.ON during intense water activities, regularly clean the strap with a damp cloth (never immerse), and store the watch in a dry location when not worn. Milano Straps offers professional replacement services at the Casati Milano atelier, where the old strap is removed with dedicated tools without risking scratches to the yellow gold case.