On the VR, V75 and VA, the centre cases were a natural finish. clutch cover, magneto cover, cylinder and head were semi gloss(satin) black.
If doing a show restoration, do not bead blast the centre cases as the finish will be incorrect. Either strip the cases or have them blasted with non evasive
material (walnut shell blasting) so as to not change the texture. PJ-1 case paint works well on the black parts.