KGB F-21 disguised in Zenit SLR case

Russian F-21 in Zenit case made by a special workshop of KMZ (Krasnogorsk Mechanical Enterprise) for the KGB, interchangeable lens 2,8/28, clockwork mechanism. The small camera takes photographs through a small hole underneath one of the neckstrap lugs, that opens for a moment only when the shutter is released (by pressing on a certain point of the back of the camera case). The shutter speeds (B, 1/10, 1/30 and 1/100) have to be changed on the camera itself, while the diaphragm can be changed conveniently by turning the tripod screw of the camera case, which is engraved with the f-stops. Authentic outfit from a KGB spy.