It is the same camera as Zorki-11 but with Zenit branding. It is extremely hard to find. Need to mention, that protype version of particular camera had Zenit Junior markings below the finder's window!
Serial Number Known:
6600113 seen Molotok
6600117 okynek
6604685 seen on Leica Shop (2004)
6606634 SovietCams
6605670 Omega