I always thought they came with Huret dropouts if they were forged. Funny thing was that they never put Huret derailleurs on the frames with Huret dropouts from what I've seen. My first Sports Tourer had a Campy Gran Turismo and my last one which was a 71 had a Schwinn Approved unit. The only thing I knew that came with Campy dropouts back then was just Paramounts. The SS was basically a Sports Tourer without the european bottom bracket shell I always though. Both had fillet brazed straight gauge chromoly tubing.