Without a doubt reproductions indeed, if you enlarge the wikipedia image you can see what looks like "percussion towers" on the left and middle gun. The right one has the same mistake and also a very strange matchholder.
The wood and iron are also, as Ulfberth stated, to modern looking.. other than that there are quit a number of weird things about these guns. Like that fragile stock on the tiller gun, as well as the rifges in the barrel.
The large cannon on the far right might also be a replica, but without further images it will be hard to say for sure.
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