1969 Leonardo da Vinci Catapult model 10 inches long

It is not actually made to fire but the wheels do roll and you can screw the end to create more or less tension on the string. It you try to fire it, you would run the risk of snapping the top bow or the strings. In 1969 Xerox had a competition on who could build the best model. This one didn't win but it seems to be in better shape than the one that did. If you google '1969 Xerox catapult competition' you can find it. Pick up at Sheridan Mall Can deliver at 50 cents per KM one way