Hamilton
Railroad H40555731— lug 20mm

The Hamilton Railroad H40555731 features a lug width of 20mm. This measurement determines strap compatibility and must match precisely the metal bars connecting the case to the strap. Any watch strap with 20mm lug width is compatible with this model.

For the H40555731, leather straps in aniline, alligator, or shell cordovan are ideal, enhancing the watch's refined character. Alternatively, acrylic NATO or FKM rubber preserve its heritage as a tool watch. Your choice depends on use: leather for formal contexts, NATO or rubber for sporadic or active wear.

To change the strap on the Railroad H40555731, you must remove the lugs (metal bars) from inside the case. Using a spring bar tool, apply pressure to the internal elastic bar until the end disengages from the groove. Handle with care to avoid scratching the case. If inexperienced, consult a professional watchmaker.

Yes, the H40555731 is fully compatible with aftermarket straps provided they respect the 20mm lug width. Makers such as Casati Milano offer bespoke leather straps commissioned specifically for this width, guaranteeing precision in lug attachment and superior construction quality.

A quality leather strap on the H40555731 typically lasts three to five years with daily wear. Noble materials such as shell cordovan or vegetable-tanned leather can exceed a decade. Longevity depends on usage frequency, ambient humidity, and maintenance (periodic cleaning and leather conditioning).