That is an early type 175 Dual Twin. The later ones had the 2-cycle oil tank on the side of the frame instead of underneath the fuel tank, and a one-piece rear wheel. ((yours will probably have the rear sprocket on a separate carrier that tremains in the frame when the wheel is removed.
It looks fairly complete and should be restorable. For pics of restoreed examples, check out the Gallery section of this website.
Graham