You are looking at 3 parts cameras

Nikkorex: is missing the film advance lever, when manually turning it, it seam to take a picture. No further testing done.

FE : missing film rewind handle, taped sun such a way that the back can be opened, electronic seam to function, not sure if Accurate. Advance lever stuck.

May have other issues no further testing completed .

FG: looks to have impact damage advance lever missing parts and is stuck. No further testing done as done.