You are looking at a Heavy Solid Brass Water Cannon. This item was salvaged from a ship that was being torn apart for scraps.

When you look at this item you can see that it is in great shape. Water cannons were mostly used to put out fires on ships, but some cargo ships and other ships would use them to help defend themselves against pirates on the seas.

This would be a unique item to add to your nautical collection! You would have to use your creative imagination to figure out what you would do with this, but this would look great in a room filled with other nautical objects!