I've got a question about my IWC; I am the proud and lucky owner of an Ingenieur Vintage Collection:

I beleived that 80111 caliber was fully manufacturated at Schaffhausen IWC factory, but I read on a forum that is actually an ETA caliber, with the base plate of 7750, and produced by ETA under the direction of IWC, is this true?, in that case, what calibers are actually designed and manufactured entirely by IWC Schaffhausen?