Strap for Horological Machine N°10 HM10 Bulldog Red Gold / Titanium

The MB&F Horological Machines 100.RL.B features a lug width of 20mm. This dimension was carefully selected by MB&F to maintain visual proportions consistent with the 45mm case diameter, creating aesthetic balance between case volume and strap width. You can verify this measurement by positioning a ruler in the lug hole, measuring between the inner edges. Confirming the lug width before purchasing an aftermarket strap is essential to guarantee perfect compatibility.

Alligator leather represents the most refined choice for this model: its regular grain creates formal contrast with the angular geometry of the titanium and red gold case. Black or chocolate brown alligator strap highlights the warmth of the red gold without competing visually. Vegetable-tanned calf leather is an excellent alternative if you desire greater wrist comfort and natural colour evolution over time. For those preferring a contemporary approach, FKM rubber on a leather base offers superior grip and modern versatility. Avoid overly thick straps: the geometric structure of the 100.RL.B requires harmonious proportions between case and strap.

The 100.RL.B strap is replaced via the spring bars (metal components connecting the strap to the case). Using a dedicated spring bar tool, press the bar from inside outward, releasing the spring. Remove the old strap and insert the new one, ensuring the metal spring bar clicks securely into position. If your strap features a deployante clasp (folding buckle), verify the mechanism functions correctly before wearing the watch. This operation should be performed with care to avoid scratching the titanium-red gold case.

Yes, any strap with a 20mm lug width is compatible with the MB&F 100.RL.B. However, material and thickness selection must consider the visual proportions of the case. Straps exceeding 4-5mm final thickness can create visual discord with the watch's slender geometry. We recommend handcrafted straps in alligator, calf leather, or FKM rubber with moderate thickness. Avoid raw nylon NATO straps, which visually conflict with this model's sculptural character. A deployante clasp is highly recommended for wear comfort and watch maintenance.

A quality leather strap (alligator, vegetable-tanned calf) has an average lifespan of 3-5 years with daily wear, extendable to 5-7 years with proper maintenance. Longevity depends on factors including wear frequency, moisture exposure, and climate conditions. Alligator leather ages beautifully, developing a desirable patina over time. To extend strap lifespan, protect it from prolonged moisture, excessive heat, and mechanical stress. If wearing the 100.RL.B daily, it is prudent to maintain at least two straps in rotation to distribute wear. FKM rubber offers superior durability under extreme conditions, readily achieving 7-10 years of functional lifespan.