Offered here is a rare Longines chronograph, circa 1960-1970s, powered by their Cal. 13ZN predecessor – the 30CH, with flyback capabilities. This example, the Reference 7412, is fitted in a large, steel case, and features a snapback waterproof layout, and oval pusher chronograph buttons. This Longines chronograph is in great vintage condition. The case has never been polished and is razor sharp, with original finishing. The sunburst dial is in great condition, with only very light wear consistent with aging.