Not a transistor radio, as it's model number would probably suggest, but a small AC/DC Mains valve radio (long & medium waves). It is quite a rare model, and it was made about 1959. The cabinet is wood, but with a distinctive two-tone rexine covering. Pam was bought out by Pye radio, who were bought out by Philips.
Valve line-up  UCH81, UBF89, UCL83, Metal Rectifier.