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IWC Grande Complication

Most IWC Grande Complication references take a 22 mm watch strap: 15 of 23.

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IWC Grande Complication lug width by case size

23 references measured. Updated 2026-10-29.

CaseLug widthReferencesWatch strap attachmentFor example
42 mm22 mm · 18 mm on 4 · 20 mm on 3 · 19 mm on 123—IW1868-01, IW1868-03, IW1868-07

References that take a different watch strap

  • IW3770-13: 20 mm, not the 22 mm of most 42 mm cases
  • IW3770-21: 18 mm, not the 22 mm of most 42 mm cases
  • IW9270-14: 18 mm, not the 22 mm of most 42 mm cases
  • IW9270-16: 20 mm, not the 22 mm of most 42 mm cases
  • IW9270-18: 19 mm, not the 22 mm of most 42 mm cases
  • IW9270-20: 18 mm, not the 22 mm of most 42 mm cases
  • IW9270-24: 18 mm, not the 22 mm of most 42 mm cases
  • IW9270-45: 20 mm, not the 22 mm of most 42 mm cases

Questions about the IWC Grande Complication

Can two IWC Grande Complication watches with a 42 mm case take different watch straps?

Yes. Of the 23 IWC Grande Complication references with a 42 mm case, 15 take 22 mm, 4 take 18 mm and 3 take 20 mm. The reference number decides, not the case size alone.

Every IWC Grande Complication reference

Other IWC families

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

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