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Seiko Prospex Sky

Most Seiko Prospex Sky references take a 22 mm watch strap: 12 of 21. The lug width follows the case size: 44 mm case → 20 mm, 45 mm case → 22 mm and 48 mm case → 22 mm.

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Seiko Prospex Sky lug width by case size

21 references measured. Updated 2026-10-29.

CaseLug widthReferencesWatch strap attachmentFor example
44 mm20 mm8—SSC347P1, SSC349P1, SSC351P1
45 mm22 mm9—SRPB57K1, SRPB59K1, SRPB61K1
46 mm24 mm1—SSC261P1
48 mm22 mm3—SSG001P1, SSG003P1, SSG005P1

Questions about the Seiko Prospex Sky

Do all Seiko Prospex Sky case sizes take the same watch strap?

No. The lug width changes with the case size: the 44 mm case takes 20 mm and the 45 mm case takes 22 mm. Check your case diameter before you buy.

Every Seiko Prospex Sky reference

Other Seiko families

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

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