Product number (P/N): ESR,
Keywords/Tags: ESR
Date of intro: ~1975,
Display: Type = Display (VFD) (List), Digits = 8+1,
Number of keys: 25, #Key-Black: 13, #Key-Red: 1, #Key-SilverColor: 11,
Miscellaneous switch: [R-D OFF-ON],
Classification: / Pocket,
Featuring: Scientific functions, Square root, PI, Logic-technology: VLSI (Very Large Scale Integration), calculator-on-a-Chip,
Serie-members: COLEX: ESR (version-1) (Yellow case); COLEX: ESR (version-2) (White case, 12 Blue Keys); COLEX: ESR (version-3) (White case, 13 Black Keys),
Known Serial-numbers: E62665 (List of all S/Ns from COLEX)
Collector value: 7.5/10,