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Hamilton Boulton

Most Hamilton Boulton references take a 18 mm watch strap: 5 of 12. The lug width follows the case size: 24 mm case → 16 mm and 27 mm case → 18 mm.

Shop 16 mmShop 18 mmShop 22 mm

Hamilton Boulton lug width by case size

12 references measured. Updated 2026-10-30.

CaseLug widthBuckle widthReferencesWatch strap attachmentFor example
24 mm16 mm—4—H13321812, H13321813, H13321821
27 mm18 mm16 mm5—H13411753, H13421511, H13421611
34 mm22 mm20 mm1—H13519711
35 mm22 mm—2—H13519561, H13519641

Questions about the Hamilton Boulton

What buckle width does the Hamilton Boulton 27 mm take?

16 mm. The watch strap is 18 mm at the case and narrows to 16 mm at the buckle.

Every Hamilton Boulton reference

Other Hamilton families

Inside each one the lug width often changes: it is the reference that decides.

All Hamilton families → · Why the size changes inside a family →