I seem to understand that other SB interiors can be found or left unpainted, or covered with a transparent varnish, but I would like to be assured that I understood well.
First aircraft of the 1936 production (it has a nameplate) has an exterior paint, presumably silver. There are no signs of any paint inside, including primer.
The second aircraft (three-bladed propeller) has a light-gray exterior paint and inside it is completely painted with A14 steel-gray.
The third aircraft (two-bladed propeller) is also light-gray on the outside, but inside the skin is covered with transparent varnish. The frame and all internal elements are not painted (exept steel parts).
