This is an "Optek" ("ОПТЭК") light meter that was made in the USSR.
It is very compact and lightweight. In fact, it is even smaller than the Sekonic Auto-Leader L-188:
This light meter is optical, not electronic. It is a clone of a German model (FILUX Platin, Balda Expophot, or something similar).
Surprisingly, the light meter is quite accurate when the correct scale is chosen: there are three options depending on the lighting conditions to compensate for eye adaptation.
My copy was manufactured in either 1954 or 1955.
User manual (in Russian):

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