Display is 8 digits, red LED.
Four function, %, memory.
Chip is Rockwell A5300PD, here date coded mid-1975.
76 x 153 x 23 mm (3.0" x 6.0" x 0.9").
Made in Great Britain, at the former Sumlock-Anita factory in Portsmouth.
Inside, showing the circuit board. The LED module with the moulded-in lenses is towards the top, while the Rockwell integrated circuit is towards the bottom.
Text & photographs copyright © 2002 - 2018 Nigel Tout, except where noted otherwise.