Hard to say if its authentic from pictures. However, it was an advanced advertising piece (probably mass produced) where the local sponsor could fill in the appropriate information. Looks like this one is blank, which of course means that it wasn't used. Gibson passed in 1947 and basically wasn't able to do anything because of illness beginning in 1943. Since this was a touring piece my best guess would be from the late 30s to very early 40s. Maybe checking the print dot process, paper composition etc. might help in authentication.
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