This small viewfinder was manufactured in East Germany sometime between the mid 1970's and mid 1980's. I believe it is an early VSN model. It features a 1/125 shutter, f2.8 lens, and scale focus delineated in meters. Exposure is assisted by a series of symbols on the lens barrel in similar yet inverse fashion to the SMENA cameras. In this case shutter speed is varied according to the film speed, while aperture is varied according to lighting conditions.
Mine is a relatively recent eBay acquisition. I've loaded a short roll of Ilford FP4 for the week.
REFERENCES:
Notes from Mosquito Hill 