This lot came from an old box of microscope and camera parts. There is a magnifier with an extra screw in lens. There are four little brass containers that were meant to hold microscope lenses, marked with size numbers. There are three containers that look like they were meant for 35mm film, to go in a camera or other photo contraption. Finally, there is an adjustable lens with screw threads meant to attach to a 4.5 mm (approx.) tube. Some pieces are marked Bausch and Lomb. I would say they are pre-1950, but I don't have precise dates- could be earlier. In good condition, as shown.