Hello Peoople!
I am back again!
This is a very interesting device.
Pictures
http://www.ussrphoto.com/UserContent/technical_smena_1.jpg and
http://www.ussrphoto.com/UserContent/technical_smena_4.jpgclearly demonstrates that the cmaera has no shutter at all. it is only a device for film advance including a focus screeen. The camera is a Smena 2 type and the left axis with a knob in the top is used to advance the film. the right one is only a guide for the shift movement assembly. If you observe current Smenas of this type, one will see that in the exact place of the cable release in camera top there are the little release knob for film advance...
This device is by sure part of a reproducing device used for copying documents, small objects or even for taking pictures through microcopes.
Being from BelOMO manufacture and having such strange bayonet this assembly seems to be an accessory for the "Belarus" enlarger (first model)- (it locks in the place of the condenser lenses) which could be transformed into a complete repro device.
It uses the enlarger lens and has a simple attachable manual shutter (open /closed-type)
Regards for everybody
LP