I don't know of a stamped Campagnolo road dropout but they certainly made stamped ones for track ends.
The '71 Sports Tourer frameset that I got from member Chrome Molly came from the Chicago cage with stamped Campy drops. All the other STs I've seen had forged Huret ones.
It's an early (Feb. 1971) Sports Tourer, so maybe they were in a rush and short of parts. The ST wasn't officially released until March of '71. Alas, the drive side drop was bent enough that I didn't want to risk using it, so it was replaced with a Campy 1010 forged piece.
