5227r, 6119r, 5167a
Sidebar: the 6119 is the most accurate hand wound I’ve ever owned, ~0.25s/d.
The evolution of the Ingenieur. It started with the 666 on the left and then moved to the 866 in the middle, which had a slightly larger case and semi-quickset date. The watch on the right is the limited edition 3239-09. It features a blue dial created for the Laureus series. There are a few more references between the 866 and 3239 that I would like to fill in.