Hi.
Collect arms and armor and early firearms. During the earliest phases of firearms development, the point of the weapons was simply to make noise and throw something. There isn't much point to be made to come up with a strong differentiation between "cannons" and "handguns". There is some manuscript evidence to suggest that even as light a weapon as the Tannenberg Gun was "crew served" inasmuch as the person that fired it might not be the person who held it.
That said, if there is interest, I'll share some of the stuff from my collection.
This is a Dopplehacken or Double Hook. it differ from other early weapons with a hook-like appendage mainly in size. It is 45" long with a bore of 1.25". There was powder in the bottom of the bore when I first got it and cleaned out the dirt. Who knows whether it was original or not.
Note that some vestiges of color remain on the barrel. Early guns were sometimes painted. The Nuremberg colors were red and green .... was this from there? Who knows.
The pear shaped cascabel indicates that it was aimed by hand.
I made a sorta generalized stand for it.
It's from the first half of the 16th century, found in France though it was probably German in manufacture.