Distinctive features: Astro navigation calculator.
Display is 10 digits, green fluorescent.
Scientific and navigation functions.
6v (4 x AA batteries) .
82 x 150 x 28 mm (3.25″ x 5.9″ x 1.1″).
About 1976 (date on instruction manual).
Tamaya & Company Limited,
Made in Japan.
Tamaya is a well known manufacturer of navigation instruments and produced mechanical instruments before these electronic calculators.
This is also a very specialised calculator using dedicated integrated circuits. The fitted wooden case is evidence of the respect which Tamaya had of its intruments.