This was the top of the line derailleur for Shimano on it's release in 1971 and was cutting edge technology.  It is widely considered to be the 1st generation of Dura Ace before the name change.

Classic old school all metal construction, very durable, built to last.

Derailleur is in excellent vintage condition.  Some scratches and wear from use.  Fully functional and works well.  See pictures for full description.

Pictures are of the actual item you will receive.