ID: 
1859
Maker's Name: 
Griffin Computors, 1 Boundary Ave, Kirrawee.
Where made: 
Australia
Dimensions: 
11.5 × 11.5 × 0.5 cm

Simple plastic circular slide rule for domestic use. Accompanying instruction leaflet explains how it can be used in conversions from imperial to metric units, as well as shopping and motoring applications. The use of both imperial and metric units, but ony decimal currency suggests it was made post-1966.