This was a fast, fun little read for the Back to the Classics Challenge. I read a bunch of books about Henry VIII and the Tudors a couple years ago so this was a nice little callback to those, even if it wasn't particularly historical.
My edition happens to be a vintage hardcover I scored on the Library Sale shelves. I'm not sure how old it is, as there's no date, but the illustration of a boy and girl reading a book on the inner cover seem like something from the 20s, so I'm guessing it's from the 1930s. Another clue might be that the author's name isn"t given as Mark Twain, but I don't know much about dating vintage books - if you do, please let me know in the comments!