Breitling “Chronomat”

Swiss Watch Fair 1970 BF 903
The chronograph ; a short-time register strapped to your wrist. But this model, designed for sports or industrial timing operations, doesn’t limit itself to that. Fitted with the logarithmic scales of a circular slide rule (corresponding exactly to the scales of a linear slide rule), it can perform all calculations : multiplications, divisions, roots, powers, cost prices, percentages, etc. And it can even be equipped with an automatic movement. (BREITLING “Chronomat”)