Hi Konstantin
Thank you, very helpful.
Some more images and comments DGM, thanks for info on bombs.
Graham, it seems that the bomb racks were a U.S. fitting?
as a this shot at Abadan shows.
the already applied red star underwing and the dark circle [fresh olive drab?] round fuselage stars is of note.
there is also this drawing
this shot mentions the winter cowl, and shows it to be a kind of shutter, the top photo shows it closed if you look carefully.
this is another shot, also in Red Stars showing 606/II with double racks,
there is another shot of this plane from the other side. A few more shots from this photo session exist it appears.
Worth posting up, or a separate thread?