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Grand Seiko Quartz

Most Grand Seiko Quartz references take a 19 mm watch strap: 9 of 17. The lug width follows the case size: 37 mm case → 18 mm, 39 mm case → 19 mm and 40 mm case → 20 mm.

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Grand Seiko Quartz lug width by case size

17 references measured. Updated 2026-10-29.

CaseLug widthReferencesWatch strap attachmentFor example
36 mm18 mm · 19 mm on 12—SBGX218
37 mm18 mm · 19 mm on 26—SBGX202, SBGX205, SBGX209
39 mm19 mm5—SBGT241, SBGV235, SBGV237
40 mm20 mm · 19 mm on 14—SBGV229, SBGV231, SBGV233

References that take a different watch strap

  • SBGX219: 19 mm, not the 18 mm of most 36 mm cases
  • SBGX319: 19 mm, not the 18 mm of most 37 mm cases
  • SBGX321: 19 mm, not the 18 mm of most 37 mm cases
  • SBGV238: 19 mm, not the 20 mm of most 40 mm cases

Questions about the Grand Seiko Quartz

Do all Grand Seiko Quartz case sizes take the same watch strap?

No. The lug width changes with the case size: the 37 mm case takes 18 mm and the 39 mm case takes 19 mm. Check your case diameter before you buy.

Every Grand Seiko Quartz reference

Other Grand Seiko families

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

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