120 back (No dark slide, but can be normally used just not detached until the roll is over). Film tested.
Film Tested Mamiya RZ67 2 backs and a 180mm f4.5 Prime Lens - EXCELLENT
MAMIYA RZ67 ETC SEKOR Z 127MM F3.5 W FULLY TESTED FWO VGC + CAP + FILTER
Split Prism Focusing Screen Type E Like Mamiya RZ67 RZ67II and RZ67 IID
[Near MINT+++] Mamiya RZ67 Pro Medium Format Camera 120 Film Back From JAPAN
[Opt MINT] Mamiya RZ67 Pro Film Camera Sekor Z 110mm f/2.8 W 120 Lens From JAPAN
FilmBack x2 [Mint++] Mamiya RZ67 Pro Film Camera Z 110mm f2.8 Lens From JAPAN