1960'S RUBIDIUM OSCILLATOR OR SCHEMATIC WANTED

[Magman]

I am looking for a Varian model 49-538A RUBIDIUM OSCILLATOR (WORKING or NOT for parts)   AND/OR A SCHEMATIC of it. What is unique about this one IT IS NOT DISCIPLINED. See attachment for pic.
Patented in the 60's by Varian and Associates.
Don  dcyoung9@yahoo.com   -- please put rubidium
in the subject line.