What I can find out so far.....
My guess is 12v DC 3PDT unknown current
Allied Radio Old Catalog 990
157 Series
157 - 22 - x - #00
THIS NOT 157-36-x-xxx (Similar to KUP style)
22 Series seems to be 2PDT
23 Series seems to be 3PDT
B200 - 12v DC 10amp
B300 - 12v DC 15amp
C200 - 24v DC 10amp
Q200 - 24v AC 10amp
T200 - 120v AC 10amp
T300 - 120v AC 15amp
U300 - 240v AC 15amp