Pusher

The pusher is an external button on the case that commands a movement function without going through the crown. The fundamental distinction, which many overlook, is between command pushers and correction pushers: the former start, stop, or reset a function in real time — the chronograph is the classic example — the latter adjust an indication discreetly, such as the day, month, or time zone.

In the two-pusher chronograph the logic is sequential: the button at 2 o'clock starts and stops, the one at 4 o'clock resets. In the flyback, a single press on the pusher at 4 o'clock resets and restarts without stopping: useful when measuring consecutive times, in aviation or sailing. In the monopusher chronograph — the oldest solution, back in fashion — a single button integrated into the crown manages the three phases in succession. It requires discipline in use: one extra press resets everything. De Bethune, Minerva, Angelus, and Hermès with the H08 adopted this geometry in recent years, each with their own mechanical interpretation.

Correction pushers often appear in complicated calendars. In the Patek Philippe 5396R the references at 2, 4, 8, and 10 carry four pushers recessed into the case flanks to correct day, date, month, and moon phase without opening the caseback. The World Time caliber 240 HU solves it differently: a single pusher advances all time zone indications in sync. Moritz Grossmann instead uses a pusher at 4 as part of a movement protection system: the pulled crown stops the balance wheel, the pusher restarts it after regulation.

The shape of the pusher says something about the period and the project. The pump pushers of the Fifties and Sixties — cylindrical, elongated, with rounded heads — are found today in reissues like the Zenith Chronomaster Revival A384. Flush-mounted pushers, level with the case, stem from profile requirements, as in the Porsche Design by IWC ref. 3702. Hanhart's red HyCeram pusher instead comes from a precise operational requirement: recognizable color in the cockpit, material resistant to repeated wear. Panerai in the PAM01699 adds a pusher at 3 to retract the minute hand in one-minute increments, transforming the chronograph into a countdown tool. Every solution has a reason; when that reason is unclear, the pusher is decoration.