Well, that's not a real cannon.
It's a picture of one taken at Disneyland Paris. You can see that it has been cast or fabricated to look real, but it isn't.
Or is it?
If you were going to go out and get a fake cannon, where would you go? And why wouldn't you just buy an old one and dress it up and make it look real.
This is the actual coat worn daily by Napoleon:
But, then again. What's genuine and what's fake?
The reason why this project has, literally, taken forever is that I have so much source material to go through and I'm doing this so that I can get most of this right.