[Milsurplus] Unk crystal adapter

[Hubert Miller]

BTW, this brings up another question on my mind. I brought back a BC-610 plug in crystal oscillator unit.
When I cast eyes on it, it occurred to me it might make with little change, a QRP type transmitter.
One knob on it actually looks "Japanese", like off something WW2 Japanese, and might come in handy for
otherwise unobtainable replacement of one missing. 
But - I want to ask first, is there already still a plentiful supply of these BC-610 TU's, like enough for existing
BC-610s ?
Sorry, I don't know the frequency range of the TU I found.
-Hue