It looks very similar to what you are describing........they were metal plate tuning capacitors for the transmitters and receivers...
As you would turn the frequency dials (Kc or Mc, Kilocycle or Megacycle as they were labeled then usually, we use Khz , Mhz today, Kilohertz Megahertz) the sections of metal plates would move into and out of one another, parallel, in close proximity to tune to the selected frequency. I've looked at my BC-375 and BC-348 tuners and they don't match but there are several other transmitters/receivers/antenna tuners that went into bombers and used this same tech.