[Arran]

  Hay Dan we both learned something new on grill cloth removal. That radio is absolutely magnificent . That my friend is freaking nice I would love to own one of those and I would put in my will that It be used as my coffin. That thing belongs in the radio museum at my house   maybe we can trade something or just do the right thing and donate it . Must see after your done.

Fred;
  I think that he had another 10-12 but the power supply was missing. However these were fairly complicated sets so he may wish to check over both of the main chassis that he has to see which is in better condition. In the chassis picture he posted I noticed that someone had been messing with it somewhat, there is a six or seven pin old  style socket, probably an Amphenol brand one, where an octal wafer socket should be. That 6F7M you were inquiring about, well this set has two of them, though I don't know why since the triode section in each tube is connected up as a diode, they could have accomplished the same result with a 6B8 and a 6K7.
  Keep your eyes open Fred, those Rogers 10-12s, as well as some of the lesser but equally pretty rolling pin style models do turn up. It seemed to be their dial of choice for the 1935-1938 period, though for 1937-38 they replaced the Celluloid drum with glass plates.
Regards
Arran