My first guess was also a Gitane Super Corsa- my first full Campy road bike in 1971. But looking at it further than tube angles don't seem the same- the seat tube is much more angled back than the steer tube. It almost looks like a criterium frame with a short rear triangle and possibly a higher bottom bracket, but that was more of a mid-70's frame building thing. The Gitane Super Corsa frame was heavily chromed, in the fork and stay ends, and not likely to disappear without HEAVY removal.
Some Gitanes did come in orange. Mine was purple and turquoise blue was popular.
'73-74-ish Gitane
The Swedish Crescent above may be more of a match there, but not sue they used French threading.
How about Mercier? Not familiar with them all that much, but also a prominent French frame in that day.