AKA: MK-57,
Date of intro: ~1984, Origin: USSR (List), Dimensions: 153x76x25mm, Weight: 130g,
Power: 4.5V: (AA x3) + Adaptor,
Display: Type = Display (LED) (List), Digits = 8+1,
Number of keys: 25, #Key-Black: 20, #Key-Blue: 4, #Key-Red: 1,
Classification: / Pocket,
Featuring: Procent, Square root, Memories: 1,
Initial Cost Price: RUB23, Collector value: 7.5/10,
Courtesy of: CALCUSEUM (Serge DEVIDTS),
Internet: Link-1: SOVIET DIGITAL ELECTRONICS MUSEUM