SIMPSON OPTICAL - 1" FOCAL LENGTH 16MM PROJECTOR LENS. This was a local state find. I am not a expert on these. From Worthpoint- “Simpson Optical 16mm wide-angle projection lens. 1" focal length, f/1.9 aperture. Get a large image with a short throw distance with this lens. Will work as it is with Ampro, Moviemite, DeVry, RCA (all except 1600 model), Forway, Victor (except model 90), Revere, Wollensak and many others. Will fit in to most other 16mm projectors with the right bushing adapter.” Lens appears to be in excellent condition with no marks or haze. Some light scratches or normal wear to the outer case. Measures 2 1/2 inches long