This paper model is the Turtle Submersible (aka American Turtle), the world's first submersible with a documented record of use in combat, the papercraft is created by [unknown], and the scale is in 1:12.
The Turtle Submersible was built in Old Saybrook, Connecticut in 1775 by American David Bushnell as a means of attaching explosive charges to ships in a harbor. Bushnell designed her for use against British Royal Navy vessels occupying North American harbors during the American Revolutionary War. Connecticut Governor Jonathan Trumbull recommended the invention to George Washington; although the commander-in-chief had doubts, he provided funds and support for the development and testing of the machine. For further information please click here.