The bottom pictures describes marine guns, used on ships (and maquettes) between the XVI and XVIII the century. But cannot specifies from which country, as their size was limiting probably their design, more or less standardized. Scale between 1:75 and 1:150 , perhaps 1:200
I had many plastic sailing ships models 15 years ago (299 model boxes), but today can no longer inspect the boxes to be more specific; perhaps the colour wold give indications on the brand, and thereafter some models within the catalogues (Heller, Revell, Zvezda, Imai, Aifix, Lindberg, Aurora, ERTL, ..)
Top picture= no idea ...