Hi, this is an interesting one. Basically the MIR was made from 1959 to 1961 - please see http://www.fotoua.com/1cameratip.php...l1=mir&seek3=3 and Jean Loup Princelle's book. The lens is from a FED camera, the MIR would have had a Industar 60 or 26M for internal consumption and a Jupiter 8 for export, this one is intended for internal consumption as it has Cyrillic script name. See http://www.ebay.com/itm/MIR-Vintage-...item2ec5e1b9c6 as an example. The only difference between the MIR and Zorki 4 was the lack of slow speeds mechanism.