HotDog
A few years ago I was given the job of checking a tech librarary for redundant documents. In it I found an original Boeing sales brochure for the B767. At that stage it was most assuredly a 3 man crew.There was nothing in the document about a 2 man crew.
Later I came across at least 2 Asian carriers who had E/Os on their B767s. However they seemed to disappear quickly so I am not sure if the aircraft were actually E/O panel equipped or the E/O was operating the pilot panel.
I suspect the real catalyst for a 2 man crew was the arrival of the
A310, not Boeings wish to suddenly go to a 2 man cockpit in what was at the time a difficult airline environment both commercially and industrially.