Kristall Flash unit.
Made in 1972.
Original price 18 rubles
In the 60s to mid 70s all the electronic photo-flash produced in the USSR (Photon, Norma FIL-1xx, Saulute, Kristall, Chaika, Svet) had a "Scale" (two scales combined) exposure calculator. Since the second half of the 70th Calculator exposure was "tabular".
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