Crown pusher

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A crown pusher combines the functions of a crown with those of a pusher in a single knob.

Although many monopusher chronographs have a pusher that is co-axial with the crown, a crown pusher is something else entirely: The crown (and stem) is the pusher. For example, in the Seiko 6139 movement, the crown is pressed to advance the date. Some other movements, including the Eterna-Matic, use a pull of the crown for this function. Very few movements have used this technology, which makes it easy to accidentally trigger a change.