Chronograph 7412 — Pulsometer and Asthmometer Dial

Longines 30CH

Manually wound integrated column-wheelColumn wheelA chronograph control system that coordinates the operating levers; a cam system is an alternative construction. chronographChronographA watch function for starting, stopping and resetting an elapsed-time measurement independently of the ordinary time display. with flybackFlyback chronographA chronograph whose reset pusher can be pressed during timing to return the hands to zero. A new measurement begins when the pusher is released, without a separate stop operation., introduced in 1947. MovementThe working mechanism inside a watch or clock. history is separate from the production spans of the case references that use it. Published counts conflict: the expert overview states 17, whereas the inspected Bolaffi 7413-9 is engraved 18 . Consult the individual specimen evidence rather than assuming a universal count.