Book showing unrelated date

While browsing on of the "The Girl With The Dragon Tattoo" page on Listal (www.listal.com/book/girl-dragon-tattoo-stieg-larsson-3345734) I saw a 1969 placed next to the tile (as when there's a date for release of movies). I didn't see any date on other books, nor 1969 seems to be related with this book at all... Smells like some bogus data ;)