Oris TT1

Most Oris TT1 references take a 25 mm watch strap: 18 of 36. The lug width follows the case size: 42 mm case → 24 mm, 43 mm case → 25 mm and 45 mm case → 25 mm.

Shop 20 mm Shop 24 mm

Oris TT1 lug width by case size

36 references measured. Updated 2026-10-29.

Case	Lug width	References	Watch strap attachment	For example
42 mm	24 mm · 20 mm on 2	12	—	01 635 7518 4464, 01 635 7518 4464-07 4 24 14, 01 635 7518 4464-07 8 24 01
43 mm	25 mm · 20 mm on 4 · 24 mm on 2	16	—	01 735 7651 4166, 01 735 7651 4166-07 4 25 07, 01 735 7651 4166-07 8 25 10
45 mm	25 mm	8	—	01 674 7659 4163, 01 674 7659 4163-07 4 25 06, 01 674 7659 4163-07 8 25 10

References that take a different watch strap

01 733 7752 4124-07 4 24 06FC: 20 mm, not the 24 mm of most 42 mm cases
01 733 7752 4124-07 8 24 08: 20 mm, not the 24 mm of most 42 mm cases
01 674 7521 4464-07 4 24 14: 24 mm, not the 25 mm of most 43 mm cases
01 674 7521 4464-07 8 24 01: 24 mm, not the 25 mm of most 43 mm cases
01 733 7668 4114-07 4 25 06: 20 mm, not the 25 mm of most 43 mm cases
01 733 7668 4114-07 8 25 10: 20 mm, not the 25 mm of most 43 mm cases
01 735 7651 4163-07 4 25 06: 20 mm, not the 25 mm of most 43 mm cases
01 735 7651 4163-07 8 25 10: 20 mm, not the 25 mm of most 43 mm cases

Questions about the Oris TT1

Do all Oris TT1 case sizes take the same watch strap?

No. The lug width changes with the case size: the 42 mm case takes 24 mm, the 43 mm case takes 25 mm and the 45 mm case takes 25 mm. Check your case diameter before you buy.

Can two Oris TT1 watches with a 43 mm case take different watch straps?

Yes. Of the 16 Oris TT1 references with a 43 mm case, 10 take 25 mm, 4 take 20 mm and 2 take 24 mm. The reference number decides, not the case size alone.

Every Oris TT1 reference

Other Oris families

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

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