MB&F
Horological Machines 35.RTL.B— lug 20mm
MB&F Horological Machines 35.RTL.B: 20mm strap. Alligator, box calf, shell cordovan and rubber, cut and stitched in Milano. Choose your leather.
Artisanal Note
"This model requires a precise 20mm lug width to preserve the original sartorial balance."
Technical Specifications
MB&F 35.RTL.BThe essential strap measurement.
Browse 20mm straps →35.RTL.B
MB&F caliber HM3 Hours, Minutes, Day / Night Indication | Date | Power Reserve Indicator
The Heritage
Compatible Straps
Selected for the 20mm lug width of the Horological Machines
FAQ
What is the lug width of the MB&F Horological Machines 35.RTL.B?
The 35.RTL.B features a lug width of exactly 20 millimetres. This measurement is critical when purchasing compatible straps: measure by positioning a digital calliper between the spring bar pins where the strap attaches to the case. Even minimal discrepancies result in construction incompatibility.
What is the best strap for the MB&F Horological Machines 35.RTL.B?
Selection depends on intended use and aesthetic preference. Alligator leather with natural tanning complements the case's sculptural character, emphasising three-dimensional texture. Shell cordovan develops patina that evolves over time, acquiring depth that mirrors metal ageing. Vegetable-tanned calf represents the compromise between elegance and daily durability. Nylon NATO offers versatility for those who wear the timepiece as an active instrument.
How do I change the strap on the MB&F Horological Machines 35.RTL.B?
Extract the case spring bars using a spring bar tool (specialised implement with a thin, forked tip). Position the tip beneath the pin, applying inward pressure toward the case: the pin releases. Remove the old strap and align the new one to the holes, then reinsert the pin until the locking click occurs. A delicate operation requiring care to avoid scratching the titanium or rose gold case.
Can I use an aftermarket compatible strap on the 35.RTL.B?
Yes, provided the strap is constructed for a 20-millimetre lug width. Artisanal straps from milanostraps.it are manufactured with precise construction tolerances, guaranteeing compatibility without excessive play. Artisanal quality ensures the strap behaves as a natural extension of the case, not as a detached component.
What is the lifespan of a leather strap on the MB&F Horological Machines 35.RTL.B?
Lifespan varies according to material and usage patterns. Alligator with natural tanning resists 3-4 years under daily wear, developing patina. Shell cordovan can achieve 5-6 years before replacement becomes necessary, owing to superior molecular density. Vegetable-tanned calf lasts 2-3 years under frequent stress, yet evolves aesthetically throughout its lifecycle. FKM rubber exceeds 4 years without significant degradation.