>>10885601They're generic enough to be suitable for most Age of Gunpowder conflicts right up to the Civil War; there's another style that's clearly inspired by 3-inch Ordance guns of the Civil War, pic related. Found an online store once that sold cannons in a six-pack package and I got some of each; also got a few of the Ordnance-type with a set of Civil War soldiers.
There's also a Playmobil cannon in the gun line, one of my oldest toys, have had it since I was like 4.