Formex Essence

Most Formex Essence references take a 22 mm watch strap: 60 of 68. The lug width follows the case size: 39 mm case → 20 mm, 41 mm case → 22 mm and 43 mm case → 22 mm.

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Formex Essence lug width by case size

68 references measured. Updated 2026-10-29.

Case	Lug width	References	Watch strap attachment	For example
39 mm	20 mm	6	—	0333-1-6901-101, 0333.1.6690.101, 0339-1-6613-101
41 mm	22 mm	12	—	0331.4.6307.710, 0331.4.6337.820, 0331.4.6367.820
43 mm	22 mm	48	—	0330.1.6321.100, 0330.1.6321.311, 0330.1.6321.713
not recorded	20 mm	2	—	0333-1-6371-100, essence essence thirtynine automatic chronometer blue

Questions about the Formex Essence

Do all Formex Essence case sizes take the same watch strap?

No. The lug width changes with the case size: the 39 mm case takes 20 mm, the 41 mm case takes 22 mm and the 43 mm case takes 22 mm. Check your case diameter before you buy.

Every Formex Essence reference

Other Formex families

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

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