The head badge will give you some help. 70's had a round, painted brass badge with the "M" above a set of wings, some time after 1980 they changed to a square, plastic type with a "M" above the word "motobecane" The company that made your bike is gone but if the bike is in good condition, you can keep it going for a long time. Main problems are the French threading, non-standard stem & seatpost diameter, & a bottom bracket that may be RH or LH. Parts can still be found on e-bay & in bike shops that handle used parts. Value is in the eye of the buyer. This touring bike was somewhere in the middle of the Moto line. I have seen Grand Tourings sold in this (Puget Sound) area from $75 to $200 Depending on condition & how many extras were on the bike. Don