This book, as I understand it, has no year of publication anywhere on or in it. That said, the "accepted" year of publication seems to be 1942/maybe 1943, I assume based on the contents.
Comiclink currently has one up for auction (note that I am not the consignor nor, as far as I know, do I know the consignor) with a date stamp that reads either June 15, 1945 or June 15, 1946 - I think that it's 1945 but perhaps someone can confirm.
So...could this mean that this book was printed and released several years later than is currently thought?? Could the same be said for the Marvel Mystery Giant? Interested to hear your thoughts...