Hi Antonio,
I am referring to the aesthetic mix of yellow or pink gold and a steel case, as opposed to the consistent use of a single color throughout. So no, I do not consider steel-cased ref. 866, to use one example, to be "mixed" because the markers are white gold.
With regard to the use of the term "mixed", we apparently have a semantic difference of opinion. I don't think of the reference to the use of different colored metals to be denigrating in any way. I actually like the look of steel with pink gold furniture very much, and own a few of that type.
Finally, I thought that I made made this point clear in my second post on the thread, but I have no doubts that IWC produced such watches, albeit in very low numbers in the case of the ref, 666 Ingenieurs.
As a related aside, have you ever seen a ref. 866 of that style? I cannot recall having seen a single example.
Regards,
Tony