Prinztronic 4.

6 v (4x AAA batteries).

Display is 8 digits, red LED.

4-functions.

55 x 120 x 20 mm (2.2" x 4.7" x 0.8").

Made Hong Kong.

A very small calculator with similarities to the Sinclair Cambridge models.

With the back removed, showing the GIMT CZL-550 calculator integrated circuit, made by General Instrument Microelectronics, here date coded 1974.

Prinztronic models