It has some 3Rensho like qualities, particularly the seat tube lug treatment but I do not think it is legit. First the fork crown lacks the forward offset; If the bike is the same vintage as the parts then it should have 3Rensho engraved into the seat stay caps. Also Yoshi Konno's lugs were distinctive with a long elegant spear points, these lugs, though nice are much shorter. After doing a bit of research, it looks like the drops are Superends, I believe they were available through the 3Rensho catalog. Will check.
got it striped down,not bb not got tool the dura bb :facepalm: ,i cant see a frame number on it,the guy i got it off said his dad got it from a mate who had lots of road bikes lived in cal usa,maybe a custom frame?