First off I'm not a Gitane expert so I could be way off here. But I have seen those lugs before, and they are a chunky inexpensive lug. I've seen those lugs that are on the fork on a variety of heavy inexpensive bikes and supposedly were made by some Japanese company called Sakie (spelling? though not the same as the Sakae components). The Gitane top of the line bikes used Nervex with cutouts or the standard short point lug with or without cutouts which I believe were also nervex, which appears to be on the frame but not on the fork.