I've been buying these things for a while and did not have a qualm about buying this one. It is period correct as the yellow seal notes were used in the European/African theater during WW2. Bogart's signature compares favorably with other examples I have compared it to. Mayo's signature also compares favorably to other examples. I have not found examples of the remaining two signatures for comparison.
Could they be forged and counterfeited? Sure... we see counterfeits everyday in this business. The sports collectibles guys deal with it too. No difference with autographs. I'd pretty much give this one a 99.9%+ chance of being the real deal.
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