[Arran]

Actually they did not use stain at all to achieve that effect, they used tinted lacquer. On the blond solid wood parts it is impossible to get that colour by using oil based stain, aniline wood dye maybe but oil stain just will not penetrate it. If they used two different species of wood that may account for why the top and bottom of the cabinet appear to be two different colours, but very likely they sprayed over the whole cabinet using a medium walnut dye tinted lacquer but more research may be in order since it's a post war set.
Regards
Arran