circa 1959 Alpha M6M
Shirt pocket radio, thermoplastic cabinet
4 5/16 x 2 15/16 x 1 5/16 inches / 110 x 75 x 33 mm
Six transistors (Hitachi), one diode, superheterodyne circuit
Manufactured by Nippon Alpha Electric Co., Ltd., Tokyo
Aka Shalco M6M, the cabinet plastic is what sets this radio apart from most others: whether blue (as in this example) or green or yellow or red, the color saturation of the plastic was very strong.