I have two recording to this December 24, 1939 broadcast. They are recordings of separate broadcasts. Neither of the recordings appears to be a rehearsal. One recording is the one with the WBBM station break about half way through. The other appears to be a clean broadcast with time for the station break but no call letters given. I have always assumed that the WBBM recording is the early East Coast broadcast and the other the West Coast repeat. There are several distinctive features of what I call the West Coast recording: 1) during Ernest Chappell's opening commercial, there appears to be the sound of a cork stopper coming out of a bottle and by the end of the show Barrymore is apparently feeling no pain. 2) When the men soliciting for charity leave there is the sound of the door closing. Barrymore shouts, "Close the door!" leaving Frank Readick forced to ad lib, "It is closed, Sir."
I was wondering if anyone could help determine whether my assumptions are correct?