http://www.oldchevytrucks.com/cgi-bin/htmlos.cgi/005.2.12450483054318197553

Other information that is only vaguely related to the question:

1924 was the first year that Chevrolet offered an auto radio.

1930 was the year that the Galvin Manufacturing Corporation started offering the "Motorola" radio as an aftermarket underdash radio for cars and trucks.