I just now had a look at some Command Sets tranmitters i bought recently. Yes, even tho i am attenuating my collection by -40 db, these still attract me. One transmitter is plain finish 274N, but the cabinet top looks like it had an altercation with some heavy equipment, and is kinda pushed down and to one side. I don't know if i can straightem that out, but i'll have to try.

There's an unmolested T-20 with a paper tag, undated unfortunately. The tag says

What's that about? Was not able to find info on any "N" version. I suppose at that date of war, the F6 also had VHF as primary, like ?? ARC-1 or ??