Another reader came to the rescue: it is a still from the 17 June 1958 Chelsea at Eight program, during which Callas sang Puccini (“Vissi d’arte”) and Rossini (“Una voce poco fa”).
That said, I pilfered the image from a blog that had pilfered it in turn from a site that all Re-visioning Callas readers should know: The Maria Callas International Archive.
I am not (yet) a member, but I note that the Archive officers include Giovanna Lomazzi, who was a loyal friend and companion to Callas.
Do any of my gentle readers subscribe to the Archive? What can you tell me about it?