Transport calculator RAS km to litres 1960 Belgium

This small handheld calculator was made by or for RAS Belgium. RAS stands for Ring Auto Sport a small company dedicated to racing cars. This gauges let you quickly calculate how for a full tank of gasoline would get you. In addition there is a counter which can be set by hand to keep track of the distance. Made of tin with plastic ratchet wheels. Shows signs of age and use. The red  leathered of the top is coming loose. The face of this calculator measures  7 cm or 2 3/4 inches. Interesting and good looking tool which could still be handy today. Check out the video for some vintage car racing!