Strap for Railroad 44 Small Second Auto Stainless Steel / Black

The lug width of the H40615735 is 22mm. This is the internal space measurement between the watch lugs—the point where the strap fits. This critical dimension must be measured precisely, excluding the lug pin diameter itself, to ensure correct strap compatibility.

The optimal strap choice depends on your intended use. For daily elegance, we recommend vegetable-tanned Tuscan leather in Cognac or Black tones, which develops a rich patina over time. For maximum functionality, dark rubber straps maintain the design's austere character. For versatility, fabric NATO straps offer tool-free changes. Shell cordovan represents the ideal compromise between aesthetic refinement and durability.

Changing the strap requires minimal tools: a spring bar tool (strap remover) or a thin-bladed knife works adequately. Position the watch face-down on a soft surface, insert your tool into the slot beneath the lug, apply gentle leverage inward to compress the spring, and slide the strap toward the opposite side for removal. The entire process takes minutes and requires no technical expertise.

Any strap with a 22mm lug width is compatible. This encompasses natural leather, shell cordovan, alligator, calf, fabric NATO, vulcanised rubber, and synthetic materials. Compatibility is guaranteed by the 22mm lug width specification, regardless of material, colour, or manufacturer. Always verify the lug width measurement before purchase.

Durability depends on leather quality and usage patterns. High-quality vegetable-tanned leather, worn daily, typically lasts 2–4 years before replacement becomes necessary. Shell cordovan and alligator straps generally last 4–6 years or longer. Humidity exposure, UV exposure, and cleaning frequency significantly influence longevity. Regular maintenance—application of leather balms, proper drying after rain—substantially extends service life.