Pocket Book 159
These are both stated 1st printings (1942). Obviously, Pocket book released only part of it's stock, saving the rest until a later time. When they DID release the rest, they put them in a different wrapper. It is unknown which cover came out first.
(Update: Bobconch@yahoo.com notes that use the "Circle PB" colophon did not begin until several months after this book's release, so it must have been the "second first printing." Thanks, Bob.)