This is the popular Watson Model 100 Bulk Film Loader. After loading it in the dark, the lights can be turned on and cartridges can be loaded in the light. Accepts 100' bulk rolls of film. Indexed dial shows how many frames have been wound into cartridge. Light-trap interlock prevents film scratches or fogging. Accepts all cassettes. Has no loose parts.
Economical way to load your own film
Film can be loaded onto cassettes in desired quantities rather than store bought 24 or 26 exposure rolls