The ETA 7750 based Double Chrono is one of IWC's greatest achievements in my opinion because it made the double chronograph complication affordable to normal luxury buyers.

I was curious though, with ETA based movements being completely made at ETA factories now to IWC specification, is that the same for the double chrono complication? Traditionally these were by IWC themselves and I was wondering if perhaps some small part of this production for these movements remained in house.