In my opinion, the true rarities of this set are high-grade low-numbered cards (1-24) from 1934. If you can find a PSA 5 or better of one of these, you've really got something!
When I was putting this set together, the blue-backed cards from 1936 were said to be rarer according to everything I read, but they were by far the easiest to find in high-grade.
Love this set! It has a cool art deco, comic book feel to it....
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