I have three instances of a type of American AA cannon in three parks in Rhode Island which I'm hoping to have identified. I believe they are 3 inch (78mm) or possibly 3.5 inch (90mm) of the WW2 era, but I don't know the exact model.
Bristol: Independence (number twenty of the twenty-eight) and Veterans Parks
Pawtucket: Slater Park: Cannon in front of the former zoo's location
Any ideas?