This just arrived today... a 1976 Gitane that is in remarkably nice shape and was a one couple bike.
Looks like the original rear wheel was replaced with a 27 inch Weinmann concave that appears to be virtually unused.
Now... if it was only a 55cm frame.
I know a couple here who need a new tandem and this might fit the bill... my friend's wife is blind so cannot ride solo and their current tandem is a bike shaped object that needs replacing.
My friend is a monster of a man who would fit a 58 cm frame quite well.
Have set it up without rear bars and had to move the saddle all the way down so I could test drive it as I work through the servicing.... nice to find that the eccentric was not welded into place and was adjustable.