Jim, Funny when I looked at this stamp my thoughts went immediately to "Philatelic Miscellany", and then I looked at the OP and it was you. If you're stumped, I fear the world is about to end. ><
In the 1938 edition of The Blue Book of Philately there is a listing for a Meyer Feldman, an attorney living in Rockaway, New York, who identified himself as a collector/dealer.
No way to confirm it is the same guy without more info about the stamp. Could be, though, he used these stamps a a seal on this outgoing dealer mail.
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