DIT-MCO hardware with Rotary switch & Nixie Tubes?
It's a stepping switch. I refer you to the complete engineering information that an engineer  would have used in 1964- "How to use Rotary Stepping Switches" from Automatic Electric. 



It's an 63MB 81-page book, scanned and linked above in it's entirety. If it disappears, look for the file named "10539-how-to-use-rotary-stepping-switches-automatic-electric-1964-ocr-r.pdf"