I had never heard of Manufrance, but I took a look at Wikapedia.
https://en.wikipedia.org/wiki/Manufrance This says that it was a mail order company that had its bikes etc made by third parties – so the name may not tell you much about it.
I think I have found the same bike on
ebay. I take the 70/75 to be the estimated production date and the bike seems to be fitted out with the parts you would expect on a decent French bike from that era. (Simplex gears, Mafac brakes, Mavic rims, etc.)
That just leaves the Manufrance frame. The only clue is the Durifort tube material sticker. The following link gives some information on that:-
http://velobase.com/ViewFramePart.aspx?ID=4a73c52b-5c10-4b59-94cf-233c2ba91426
All in all, the bike looks like an interesting project – if it stays at anything like the current low price.