In reference to the freq meters, I have an LM11 in a BC221 style metal case.  It was some kind of unit made to mount and power up the LM10 or 11, made by a contractor long ago.  I think mine is serial number 2.

Another oddity I had never seen advertised or in person before until a ham buddy brought one to show and tell at our monthly lunch in Spartanburg, SC. It was a cabinet that contained an AC PS, volume, RF gain, mode switch and a speaker, with an opening that any ARC 5 receiver could slide into and make up with the standard ARC RX jack and operate like a desktop receiver.  Made in California by some garage shop builder perhaps.  You would think that thing would have sold like hotcakes, and still be found everywhere today.

Charlie, W4MEC in NC