IWC Portugieser

Most IWC Portugieser references take a 22 mm watch strap: 199 of 354. The lug width follows the case size: 41 mm case → 20 mm, 42 mm case → 22 mm, 43 mm case → 22 mm and 44 mm case → 22 mm.

Shop 18 mm Shop 19 mm Shop 20 mm Shop 21 mm Shop 22 mm

IWC Portugieser lug width by case size

354 references measured. Updated 2026-10-29.

Case	Lug width	References	Watch strap attachment	For example
40 mm	20 mm	11	—	IW3583-03, IW3583-04, IW3583-05
41 mm	20 mm · 18 mm on 1 · 21 mm on 1	108	—	IW3712-01, IW3712-02, IW3712-04
42 mm	22 mm · 20 mm on 8 · 18 mm on 4 · 19 mm on 1	79	—	IW3442-02, IW3442-03, IW3442-05
43 mm	22 mm · 20 mm on 2 · 18 mm on 1	28	—	IW5102-02, IW5102-03, IW5102-04
44 mm	22 mm · 18 mm on 4 · 20 mm on 1 · 21 mm on 1	80	—	IW3905-01, IW3905-02, IW3905-03
45 mm	22 mm · 20 mm on 2 · 21 mm on 2 · 18 mm on 1	23	—	IW3266-06, IW3440-01, IW3440-02
46 mm	22 mm · 20 mm on 6 · 18 mm on 2 · 21 mm on 1	24	—	IW3902-02, IW3902-06, IW3902-08
not recorded	22 mm	1	—	IW5017-09

References that take a different watch strap

IW3712-03: 21 mm, not the 20 mm of most 41 mm cases
IW3712-14: 18 mm, not the 20 mm of most 41 mm cases
IW325-01: 20 mm, not the 22 mm of most 42 mm cases
IW325-02: 18 mm, not the 22 mm of most 42 mm cases
IW325-03: 19 mm, not the 22 mm of most 42 mm cases
IW3904-02: 20 mm, not the 22 mm of most 42 mm cases
IW3904-05: 18 mm, not the 22 mm of most 42 mm cases
IW5000-03: 18 mm, not the 22 mm of most 42 mm cases
IW5000-04: 20 mm, not the 22 mm of most 42 mm cases
IW5007-02: 20 mm, not the 22 mm of most 42 mm cases
IW5441-02: 20 mm, not the 22 mm of most 42 mm cases
IW5441-03: 18 mm, not the 22 mm of most 42 mm cases
IW5441-04: 20 mm, not the 22 mm of most 42 mm cases
IW5441-07: 20 mm, not the 22 mm of most 42 mm cases
IW5703-03: 20 mm, not the 22 mm of most 42 mm cases
IW5463-01: 18 mm, not the 22 mm of most 43 mm cases
IW5463-03: 20 mm, not the 22 mm of most 43 mm cases
IW5463-05: 20 mm, not the 22 mm of most 43 mm cases
IW3905-05: 18 mm, not the 22 mm of most 44 mm cases
IW3905-07: 20 mm, not the 22 mm of most 44 mm cases
IW3940-04: 18 mm, not the 22 mm of most 44 mm cases
IW3940-05: 18 mm, not the 22 mm of most 44 mm cases
IW5044-01: 18 mm, not the 22 mm of most 44 mm cases
IW5044-04: 21 mm, not the 22 mm of most 44 mm cases

And 14 more in the full list below.

Questions about the IWC Portugieser

Do all IWC Portugieser case sizes take the same watch strap?

No. The lug width changes with the case size: the 41 mm case takes 20 mm, the 42 mm case takes 22 mm, the 43 mm case takes 22 mm, the 44 mm case takes 22 mm and the 46 mm case takes 22 mm. Check your case diameter before you buy.

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

Yes. Of the 79 IWC Portugieser references with a 42 mm case, 66 take 22 mm, 8 take 20 mm and 4 take 18 mm. The reference number decides, not the case size alone.

Every IWC Portugieser 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 →