This shutter mechanism is meant for Soviet FKD large format cameras, but it may also be adapted to other large format cameras (covers 5x7 and 8x10). The shutter is in near-mint condition, with only some minor scratches on the shutter speed indicator plate. Mechanically, it functions perfectly, although the 1 and 2 second shutter speeds seem slightly fast. The inside of the shutter is threaded to accept a lens, but it also comes with a quick-detach threaded flange. These threads are metric and meant for the Soviet large format lenses that would accompany these cameras, but may also work with other types of large lenses. The shutter has a threaded socket for a shutter-release cable, and comes in its original Styrofoam box.