The included factory letter states the revolver was shipped in December of 1959 as a model BKH36. With wide base serrated ramp front and Micro adjustable rear notch sights, first style flat top frame, type 3 straight cut ejector rod housing, type 3 ejector rod with flat round head, serrated blue hammer with polished sides, and aluminum alloy grip frame. The grip frame is black anodized and the remaining components are blue with a slight plum tint on the loading gate. With smooth grips with nickel and black Ruger medallions. With unnumbered correct model factory box and papers.