AKA (Label): MODEL 820R, ELECTRONIC CALCULATOR, Product number (P/N): 820R,
Keywords/Tags: 820R
Date of intro: 1976, Origin: Japan (List), Dimensions: 150x85x35mm,
Power: Rechargeable,
Display: Type = Display (VFD) (List), Digits = 8+1,
Number of keys: 22, #Key-Black: 11, #Key-Blue: 10, #Key-Orange: 1,
Keyboard Array (Rows x Columns): 05x05,
Classification: / Pocket,
Featuring: Procent, Square root, Logic-technology: VLSI (Very Large Scale Integration), calculator-on-a-Chip, Memories: 1,
Main Components: NEC: µPD277C,
Resemblance with: (Resemblance 007_05_05_22E),
Known Serial-numbers: 40924323 (409 24323) | 50152866 (List of all S/Ns from CITIZEN)
Initial Cost Price: DEM170, Collector value: 7/10,
Courtesy of: CALCUSEUM (Serge DEVIDTS),
Internet: Link-1: Robert LACOSTE