c.1961 Grand Prix GP-21
Shirt pocket radio, thermoplastic cabinet
3 3/4 x 2 7/16 x 1 3/16 inches / 95 x 62 x 30 mm
Six transistors (Matsushita), superheterodyne circuit
One standard 9-volt battery
Manufactured by Fukoku Electro-Ind. Co, Ltd., Japan
One of those classic 1960s small pocket radios with a round speaker grille and some nice reverse-painted plastic covering the dial area. This set appeared under several other names as well.