Picture courtesy  Crinolyn

Gordon M. did some research, and concluded, from a non-English source (paraphrased below), that the gal here is Piper Laurie, in a publicity ad.  If anyone has further information, it would be appreciated.

The Bell Telephone Hour was the name of a weekly NBC radio program which aired a weekly concert beginning June, 1940; these concerts, dedicated to classical and Broadway music, were sponsored by Bell Telephone Company. 
The program continued on the television between 1959 and 1968.