Dave Bilenkey opined as that there Sugino thing on the Gitane is not original.
I'm thinkin' while that bike was sliding around in the back of the shop, someone just slid right up to it and quietly removed the nice Stronglight 93 crankset that was normally stock on these things.
Charles "almost bought a TDF in 1973, but opted for a Mondia Special instead" Andrews SoCal