Typical WWII-era valves - the ARP12 and AR8 were often found alongside the ATP4 in portable transceivers like the WS18, WS38 and WS46.
The manufacturer and date-of-manufacturer can be worked out from the "slash" code - the thing like [KB/D] printed on the envelope.
See
http://www.vmarsmanuals.co.uk/newsle.../cv_valves.pdf for how to decode.
-G6Tanuki.