I found this old post on the Huntron 10005B oscillator and there was a schematic of a kit once sold by Huntron.
https://huntron.com/forum/index.php?topic=119.0
I tried building one from the schematic but there are two parts not identified ? IC1 and IC2
My circuit does not work and I suspect my problem might be what I have used for IC1 and 2. If anyone knows for sure what the part number used is can you please post it here.
Best regards
PS bottom photo is the Oscillator kit PCB by Huntron
LM336BZ-2.5
Huntron Part #05-5011
The last pic you lifted is actually one of my boards...