I also have an early Crane (in some parts I picked up at a Swap meet) and the "GT-300 Le Tour", which resides on the rear of my 1973 P-15 Paramount. I agree with Harvey that except for the markings, they are one and the same derailleur. And, to paraphrase Frank Berto in THE DANCING CHAIN, thank God Schwinn was smart enough to dump the Grand Trashmo last used in the 1972 model for the Shimano on the 1973 P-15. Dave Novoselsky, Chicago, Illinois