IWC Ingenieur 666A
The IWC Ingenieur 666A takes a strap made to measure on the watch itself: the bracelet is part of the case, so no band bought by millimetres will fit.

IWC · Ingenieur
The IWC Ingenieur 666A takes a strap made to measure on the watch itself: the bracelet is part of the case, so no band bought by millimetres will fit.
Have yours made at the atelier- Lug width
- integrated bracelet
- Case diameter
- 36.5 mm
- Reference
- 666A
- Family
- Ingenieur
- Case material
- Acciaio
- Model
- Ingenieur 666A Stainless Steel / Ivory
- Year
- 1954 - 1958
Sizing notes
- The bracelet is drawn as part of the case, so there is no lug width to match and no catalogue band will go in. A strap is still possible: it is cut and fitted on the watch in the atelier, from the case measurements taken by hand. Why no strap fits an integrated bracelet →
Why no standard band fits this one
On the IWC Ingenieur 666A the bracelet is drawn as part of the case: the first link continues the case profile instead of sitting in a gap between two lugs. There is no lug width to match, so there is no size to order, and a band bought by millimetres will not go in whatever the number.
It is not a rare way to build a watch. 2,640 references in the database are built this way, and across every brand it is 5.7% of the catalogue. What replaces the bracelet is a band cut to this case, shaped to close the opening the way the bracelet did.
Other Ingenieur references
- Ingenieur 666AD Stainless Steel / Black666AD
18 mm - Ingenieur SL Jumbo Stainless Steel / BlackIW1832-01
18 mm - Ingenieur Automatic Carbon Performance Ceramic YellowIW3224-01
20 mm - Ingenieur Automatic Carbon Performance Ceramic RedIW3224-02
20 mm - Ingenieur Automatic Carbon Performance Ceramic GreenIW3224-04
20 mm - Ingenieur Automatic AMG Black Series CeramicIW3225-03
18 mm