Was looking back at this thread and noticed my original pics had disappeared. Here are some fresh ones just to help fill in the blanks. Not the exact same pics but I hope they will help.
1980 Mclean perfect pleasure with campy triple + rally rear der.
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1989 Schwinn Paramount OS
1980 Mclean/Silk Hope Sport Touring
1983 Bianchi pista
1976 Fuji Feather track
1979 raleigh track
"I've consulted my sources and I'm pretty sure your derailleur does not exist"