Welcome to the forums. It's definitely a frankenbiked Motobecane Le Champion. That's almost certainly an incomplete 'zero', as opposed to a 'C', in the serial number. Based on the Motobecane serial numbers and data that I've collected, this one should be very early 1970s, circa 1971-1972. Notable are the Campagnolo Nuovo Tipo hubs with the kidney shaped holes that were reportedly custom ordered for the 1972-1973 Motobecane Le Champion, per Chuck Schimdt. Once you pick it up, there will be date codes on the rear derailleur and hub locknuts, that will aid in the dating, provided they are OEM. Partial photo assist, as they wouldn't all load for me...