Abstract: A combination recorder pen and recorder pen clip is disclosed having interfitting features to facilitate easy assembly and procedure. The marker pen includes a cartridge which is provided with a pair of longitudinally extending bottom ridges, a pair of longitudinally extending side ledges and a pair of forward, downwardly extending projections. The clip includes a flat body within which is punched a pair of longitudinally extending slots of size and position to receive the ridges therein. The clip terminates forwardly in a nose which is designed to stop against the downwardly extending projections. Side flanges extend from the flat body of the clip for frictional engagement with the cartridge sidewalls over the side ledges. In a preferred embodiment, the ridges and ledges include sloping ramps to facilitate sliding engagement of the clip and the cartridge.