#chronograph mechanism

A flyback chronograph stops, resets, and restarts in a single press, even while running. A working dealer's guide to the mechanism, its 1936 Longines patent, and what it costs to own one today.

What is a rattrapante? A working dealer's plain-English guide to the split-seconds chronograph: how the heart cam and catch-up spring work, its 1844 origin, and why it costs roughly double a standard chronograph to build.