Copyright 1915. I know this to be an ANTIQUE copy because there is a gift inscription dated 1917. This leads me to believe that my other 3 Bobbsey Twins listings (of this format) are also antique because all 4 books came from the same household. I believe this is the format of Grosset & Dunlap first editions. Worn boards with some fraying, bumped corners and fading - see photos. (SW2) (10B)