Imperial Companion

Display is 8 digits, green fluorescent in a single tube.

4-function, %.

4.5 v (3 x AAA).

50 x 92 x 20 mm (2" x 3.6" x 0.8").

Made in Japan for Imperial Business Equipment Limited, Leicester, England.

A tiny calculator only just bigger than a credit card, though much thicker. Also this size is the Imperial 81M.