See this? Fourteenth century cannon?

[BillinOregon]

14th-century cannon discovered off Swedish coast - Medievalists.net

An international research team has confirmed that a cannon discovered off Sweden's west coast dates back to the 14th century. It might be Europe’s oldest shipboard cannon.

www.medievalists.net

 

[Mike_1066]

14th-century cannon discovered off Swedish coast - Medievalists.net

An international research team has confirmed that a cannon discovered off Sweden's west coast dates back to the 14th century. It might be Europe’s oldest shipboard cannon.

www.medievalists.net

That looks just like an early Bombard of the 14 century that the Scottish kings used. The copper alloy indicated was actually Bronze (copper and tin).

(Edit) I actually didn't notice the measuring scale at the bottom of the photo. I'm assuming it is denoted in inches and not centimeters. If so the cannon is of length about 45 inches. Most likely used in the Hundred Year's War in which the pieces where very small, they fired lead or iron ball.