Hmmmm. I'm so old that, when I was in my fifth or sixth year of school, "fountain pen" and "cartridge pen" were different beasts, and the cartridge style was considered a barely-acceptable substitute. (Or, does 'cartridge' in this context refer to the inner reservoir of a "loadable" fountain pen?)

All the desks had holes in the top where a standard-sized ink bottle could be inserted. The horror! :-)