IWC Pilot

Most IWC Pilot references take a 21 mm watch strap: 163 of 382. The lug width follows the case size: 39 mm case → 20 mm, 41 mm case → 20 mm, 42 mm case → 21 mm and 43 mm case → 21 mm.

Shop 16 mm Shop 18 mm Shop 19 mm Shop 20 mm Shop 21 mm

IWC Pilot lug width by case size

382 references measured. Updated 2026-10-29.

Case	Lug width	References	Watch strap attachment	For example
28 mm	14 mm	3	—	IW4421-02, IW4421-03, IW442101
34 mm	16 mm	4	—	IW3256-01, IW3256-02, IW3256-04
36 mm	18 mm	27	—	IW3240-01, IW3240-02, IW3240-06
38 mm	19 mm	13	—	IW3253-01, IW3253-02, IW3253-05
39 mm	20 mm · 18 mm on 1	66	—	IW3248-01, IW3251-01, IW3251-02
40 mm	20 mm	28	—	IW3270-01, IW3270-02, IW3270-03
41 mm	20 mm	34	—	IW3247-02, IW3247-03, IW3247-05
42 mm	21 mm · 20 mm on 5	99	—	IW3711-01, IW3711-02, IW3711-03
43 mm	21 mm · 20 mm on 7	48	—	IW3777-01, IW3777-04, IW3777-06
44 mm	21 mm · 20 mm on 6 · 22 mm on 3 · 18 mm on 2 · 17 mm on 1	30	—	IW3201-01, IW3201-02, IW3201-03
45 mm	21 mm · 20 mm on 1	11	—	IW3891-01, IW3891-03, IW3891-04
46 mm	22 mm · 20 mm on 6 · 18 mm on 1	18	—	IW3778-01, IW3791-04, IW3791-05
not recorded	20 mm	1	—	Pilot's Watch Chronograph

References that take a different watch strap

IW3251-12: 18 mm, not the 20 mm of most 39 mm cases
IW3879-05: 20 mm, not the 21 mm of most 42 mm cases
IW3894-01: 20 mm, not the 21 mm of most 42 mm cases
IW3894-02: 20 mm, not the 21 mm of most 42 mm cases
IW3894-04: 20 mm, not the 21 mm of most 42 mm cases
IW3894-09: 20 mm, not the 21 mm of most 42 mm cases
IW3878-03: 20 mm, not the 21 mm of most 43 mm cases
IW3878-05: 20 mm, not the 21 mm of most 43 mm cases
IW3883-04: 20 mm, not the 21 mm of most 43 mm cases
IW3883-05: 20 mm, not the 21 mm of most 43 mm cases
IW3883-06: 20 mm, not the 21 mm of most 43 mm cases
IW3883-07: 20 mm, not the 21 mm of most 43 mm cases
IW3883-09: 20 mm, not the 21 mm of most 43 mm cases
IW3261-04: 20 mm, not the 21 mm of most 44 mm cases
IW3718-02: 20 mm, not the 21 mm of most 44 mm cases
IW3718-03: 20 mm, not the 21 mm of most 44 mm cases
IW3718-05: 20 mm, not the 21 mm of most 44 mm cases
IW3718-07: 17 mm, not the 21 mm of most 44 mm cases
IW3890-01: 20 mm, not the 21 mm of most 44 mm cases
IW3890-02: 20 mm, not the 21 mm of most 44 mm cases
IW3890-13: 18 mm, not the 21 mm of most 44 mm cases
IW3890-15: 18 mm, not the 21 mm of most 44 mm cases
IW3950-01: 22 mm, not the 21 mm of most 44 mm cases
IW3950-03: 22 mm, not the 21 mm of most 44 mm cases

And 9 more in the full list below.

Questions about the IWC Pilot

Do all IWC Pilot 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 20 mm, the 42 mm case takes 21 mm, the 43 mm case takes 21 mm and the 44 mm case takes 21 mm. Check your case diameter before you buy.