Please help identify this cannon

[sussexmuzllodr]

Disclaimer: I am no expert but it looks like cast iron sewer pipe cobbled together.

 

[beyu]

I know very little about cannons, but just looking at it —

Whoever designed and built this thing was really scared of it blowing up when fired. That's why the barrel is so large and the bore so small by comparison; not to mention all the bands running around its circumference. I bet the thing is made of inferior iron.

It is probably either a signal gun or was just used for salutes.