This is a signal lamp that has been modified to contain a Kiev-30 camera.
Photo 1 shows the front of the lamp with two sliders that change the filter colour (red or green). The button at the top of one of the sliders is the shutter release. The filter that covers the lens of the Kiev-30 can be seen on the side of the lamp.
Photo 2 shows the clip that holds the lamp closed and also the slider under the hand-strap for advancing the film and cocking the shutter.
Photo 3 shows the inside of the lamp with the camera, spare bulb and batteries.
I suspect that like the cigarette pack cameras, this may very well be modified for collectors trather than the security services.

David Tomlinson.