The lack of braze on's paint color with eurpean 531 decals if orginal would,(the only reason they are in doubt is it is very rare to see French or European foil decals and metalic paint in this nice of condition.) combined with fairly nice lug work and somewhat aggressive racing geometry would indicate a fairly nice 70's bike from likely from Northern Europe some more detailed pics of the lugs and dropout's would help with narrowing things down. Definetly worth way mor than the $140 you paid. I'm not a big fan of agressive road to semi track type conversions but this one looks well done I like it.