Mantua Models American Coast Cannon 18th Century Kit Building a Mantua historical model is an exciting and achievable project for the novice and experienced model maker. Each Mantua kit contains laser cut wood, brass and copper fittings. This small cannon was used in the defence of the eastern coast of the USA for more than 30 years. Easy to handle, this cannon was ideal for gunnery training. Size: 100mm x 150mm. Scale 1:17 Please note: Cannon is now copper instead of brass.