1959 Perdio Piccadilly PR 721
Small portable, nylon cabinet
6 3/4 x 4 1/4 x 1 3/4 inches / 171 x 108 x 45 mm
2-band MW/LW, seven transistors (Mullard, OC44, 2x OC45, OC71, 2x OC81, OC81D), superheterodyne circuit
One 9-volt battery
Manufactured by Perdio Electronics Ltd.; London
Some references show a 1958 introduction for the PR 721, but Iíll go with James Buttersís comprehensive web page on the Perdio Piccadilly as having been released in 1959.
The Piccadilly has a nylon cabinet, something not all that common among transistor radio cabinets: Several other European manufacturers such as TED (France) and Siemens-Austria also used nylon for some of their transistor radio models' cabinets; and in the US, the famous Zenith Royal 500 series made use of nylon cabinets.
The Perdio Piccadilly shares the same chassis, pc board, and transistor complement as its Londoner PR 7 successor, which likely was released within a year or two of the Piccadilly's release.
On this set, both the LW and MW bands are calibrated simply in meters — most other European LW/MW radios didn't display the LW band in meter calibrations but rather designated by name the few LW broadcasters at their spots on the tuning dial.