SOM Berthiot Zoom 1:2 17-85mm zoom lens for C mount movie cameras. I am pretty certain this will fit Bolex 16mm cameras. The glass has no fungus or scratches but there is a very thin line of " haze " around rear elements outer edge. It will probably clean right off.  A prior owner etched USN 620 AOP on the barrel. It may be a United States Navy i.d. The zoom works and the blades work fine. Should be a good user lens.