We love this “Siffert” chronograph, representing a kind of “poor man’s Heuer Autavia” (- named after Formel 1 racing driver Jo Siffert who was the first in the Formula 1 circus to promote Heuer). This watch has seen very little use, and deserve the “mint” classification. It is driven by a Valjoux 7734 movement that is signed Tissot 2070. The movement also has a Tissot serial number. Ca 1972.