Zorki-1 - soviet rangefinder camera, manufactured Krasnogorsk mechanical plant from 1948 to 1956.Mount M39×1 threaded lens connection.This camera was made in 1954. There is a sync contact for the flash on the front panel of the camera.This synchro contact was installed manually according to the description from the book Meisenberg Design and Repair of Cameras. See the attached video file for how the flash works. https://youtu.be/TCeI6uzmyHo Specification: Film: 35mm Frame size: 24 x 36 mm Shutter speed: from 1/500 to B Lens: Industar-22 f3.5/50 Focusing range, m: from 1 to oo Serial #139186 See my other interesting lots.