Mamiya HM401 Film Back for 645 AF AFD Cameras *** READ ***
It comes with a Dark Slide, Film Insert
It shows signs of use.
The battery cover is damaged. A battery is only needed for operating the back when not attached to the camera; while on the camera it takes power from the body.
Aside from this issue the back has been tested and works well. Film loads, advances, and rewinds properly.