Have a look at this illustration:
http://chevy.tocmp.com/radios/51rs38.htmThe bezel and buttons shape are distinctive and exclusive to this radio. The bezel is always plastic and usually a wine coloured plastic. There are two models, one manufactured from 1947 to about 1950 and the other from 1951 to 1953. They look very similar on the outside except the earlier model has a back cover with a parting line that is slanted in the vertical on the sides.
