The backdrop for this set measures an impressive 23″ by 15″. The backdrop city and sky are curved in opposite directions to give it an oval shape which does not show in the picture. The cannon can fire the two darts and the two blue spaceship darts at the backdrop or the two target ships. The cannon has a periscope mirror to line up the shot. This set was produced sometime between 1953 and 1957.
From my private collection.