The boards look like those made by Aerotron. A definite blast from the past of the late 1970's version I used to maintain for hospitals in 160 mhz at multiple sites in NYC and CT. There were lots of them around on all bands and yes they were dirty.
For a real blast these were used with REACH pagers for the hospital paging. A 5 year LiOn battery life with sleep mode.
The ones I worked on were hi power 250 watt, and unfortunately I don't have any documentation from them. You might try looking at some Aerotron radio books of that era.
