Extremely rare, one of a kind toy prototype. This prototype was exhibited at the 1916 Toronto Exhibition. The package includes two complete working cannons, two targets, all pieces for demonstrating construction in stages - the perfect display for a toy exhibition, 16 original cannon balls, approximately 15 - 20 original flyers, part of the original shipping box, copy of the patent (original available online), appraisal certificate and an original letter from the grandson of the inventor. Truly a one of a kind piece for any collector of Canadiana, militeria, or antique toys. This is STILL WORKING! Watch the video for a demonstration.