Industar-61 L/D 55 mm F/2.8, USSR Objektiv für FED Zorki Leica M39! s/n: 9411381
Industar-61 L/D 55mm F/2.8, USSR Lens For FED Zorki Leica M39 screw mount. It was available in the M39 lens mount, or "Leica thread mount". It is a copy of the Carl Zeiss Tessar 50mm f2.8. Lens mount: M39.