Definitely an Araya manufactured frame, as suggested by Luker. However, it is not the same as Belindamood's. The seat and down tubes are definitely round at the ends and flattened in the middle. Conversely, Belindmood's has a true aero downtube, with the teardrop profile extending right up to the special head lug. Belindamood's bicycle is top end, while the OP's appears to be mid-range.
Belindamood's bicycle is circa 1981-1984, which were the years foir Dua-Ace Ax. Knowing the component date codes and the frame serial number may help in decyphering the Araya serial number code.
I get the impression that the OP's bicycle has already being repainted, prior to his receiving it.