[Arran]

Red, black, blue, and yellow, blue and brown is the "B" side, black and red is the "A" side, I think that was the RMA standard code, though it did very. Unless you plan on running it from batteries it doesn't matter for anything other then esthetics, at least the battery cable is fairly short compared to some of my farm sets. For whatever reason brand Z was still using that awful rubber/gutta percha wire up until 1948 whilst Philco switched from rubber to vinyl almost immediately after the war, alternating between using it and cloth wire.
Regards
Arran