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Jaeger-LeCoultre Master Extreme

Most Jaeger-LeCoultre Master Extreme references take a 20 mm watch strap: 17 of 21.

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Jaeger-LeCoultre Master Extreme lug width by case size

21 references measured. Updated 2026-10-29.

CaseLug widthReferencesWatch strap attachmentFor example
41 mm20 mm3—207857J, 208A570, 208A57J
42 mm20 mm · 21 mm on 2 · 22 mm on 19—1752121, 1752140, 1752421
44 mm20 mm3—186T170, 186T670, 186T770
46 mm20 mm3—205C570, 205C571, 205L570
47 mm20 mm · 22 mm on 13—203T540, 203T541

References that take a different watch strap

  • 1718470: 22 mm, not the 20 mm of most 42 mm cases
  • 1738470: 21 mm, not the 20 mm of most 42 mm cases
  • 2068570: 21 mm, not the 20 mm of most 42 mm cases
  • 203S540: 22 mm, not the 20 mm of most 47 mm cases

Every Jaeger-LeCoultre Master Extreme reference

Other Jaeger-LeCoultre families

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

All Jaeger-LeCoultre families → · Why the size changes inside a family →