CWB 1971 SSS
I have a Gran Turismo on my desk. It weighs 2.1 Lbs without the claw hanger!
The pulley cage always reminded me of the Grim Reaper's Death Scythe.
Or... a Klingon Bat'leths...
Sorry for the snarky welcome to BF but those paper weights "don't get much respect" around here. As the late Frank Berto once said, they're SO strong that if something goes awry with a Campy Gran Turismo RD it will tear the dropout off before bending!
Good luck. If you are looking for originality then by all means go with the Gran Turismo. For performance, just about any long arm rear derailleur from the mid 1970's on will give better shifting...
verktyg