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These stars are pictured in an American institution called, I think, an automat. Here you put you coin in the appropriate dish and the window opens up for you.
I can’t identify many of them. Chaplin is obvious a third of the way up on the left. Charles Laughton, as Henry VIII, is tucking into a pie perhaps also a third of the way up on the right hand side. Bob Hope probably is on the right just above the bottom margin. I would guess that the Arab on the left side at the bottom is Peter O’Toole as Laurence of Arabia. I don’t know who played Frankenstein (Boris Karlof?) but he is clearly to be seen holding his cup of coffee. I suppose the lady in white tie tuxedo and top hat is Marlene Dietrich. The only ‘black’ star present would surely be Al Jonson. (Political Correctness was to arrive much later than 1951.) Orson Wells would obviously be there but there are several men who could be him as far as I can see. Several others look vaguely familiar but I can’t identify any of them. I think 1951 was too early for Marilyn Monroe.
I can see Abbott and Costello - possibly the unfunniest duo ever, Bob Hope, Harold Lloyd, Rudolph Valentino, Peter Lorre, Edward G Robinson with Clarke Gable?, Danny Kaye and Bette Davis. Marlene Dietrich and Bob Hope seem to appear twice.
The man on the ground is not using a metal detector. He is checking for mines. The goblin with the pot of gold is afraid of being found out. He is ‘safe’ until the detectors are invented.
The original picture represented a fashion in Tudor times for exploration and adventures in the new world – especially the Americas. Here the cartoonist suggests that the boys might not be thrilled at the prospect being urged.