Hamilton Railroad

Most Hamilton Railroad references take a 22 mm watch strap: 21 of 42. The lug width follows the case size: 28 mm case → 14 mm, 40 mm case → 20 mm, 42 mm case → 22 mm and 44 mm case → 22 mm.

Shop 16 mm Shop 18 mm Shop 20 mm Shop 22 mm

Hamilton Railroad lug width by case size

42 references measured. Updated 2026-10-30.

Case	Lug width	Buckle width	References	Watch strap attachment	For example
28 mm	14 mm	—	6	—	H40311121, H40311191, H40311691
32 mm	16 mm	—	4	—	H40405121, H40405191, H40405691
38 mm	18 mm · 20 mm on 1	—	5	—	H40415115, H40415735, H40415915
40 mm	20 mm	—	6	—	H40505551, H40505731, H40555131
42 mm	22 mm	—	8	—	H40515131, H40515181, H40515731
44 mm	22 mm	—	8	—	H40615135, H40615555, H40615735
46 mm	22 mm	20 mm	5	—	H40616135, H40616535, H40616555

References that take a different watch strap

H40415135: 20 mm, not the 18 mm of most 38 mm cases

Questions about the Hamilton Railroad

Do all Hamilton Railroad case sizes take the same watch strap?

No. The lug width changes with the case size: the 28 mm case takes 14 mm, the 38 mm case takes 18 mm, the 40 mm case takes 20 mm, the 42 mm case takes 22 mm and the 44 mm case takes 22 mm. Check your case diameter before you buy.