AKA (Label): Model No. Mark 4, Product number (P/N): 4,
Keywords/Tags: 4 | MARK 4
Date of intro: ~1974, Origin: USA (List),
Adaptor: AP_adaptors: M4M14,
Display: Type = Display (LED) (List),
Number of keys: 19, #Key-Black: 5, #Key-Grey: 10, #Key-Red: 4,
Keyboard Array (Rows x Columns): 05x04,
Classification: / Pocket,
Featuring: Procent,
Known Serial-numbers: K416366 (K4-16366) (List of all S/Ns from APF)
Collector value: 8/10,
Courtesy of: CALCUSEUM (Serge DEVIDTS),