Indeed they did. I had one new in box when I bought my 500C and new in box when I sold it 20 years later. It probably still is NIB. I was a folding thing with a frame on one end and a peep hole on the other. The hole end slide to different focal length. The whole thing mounted on the left side where there is a rail with the camera name and model on it. Mine was a 500C. Don't know if it fits a 501. I thought those were Levis.