I've had my great grandfathers Marlin Grade "C" model 1898 since 1964. This is a external hammer gun and was Marlin's first pump. I looks similar to a Winchester 1897. It ejects from the side but loads from the bottom. It's a beautiful gun and I cherish it. Got my very first perfect score on trap with it.
Several variations of the model 1898 operated the same way up to (I think) 1931. Mine was made in 1901.
Carl