Zenith 3019/400 pusher extension 953/4

Zenith

Founded in 1865 by Georges Favre-Jacot, Zenith is a prestigious Swiss watch manufacture renowned for its in-house movements and exceptional chronometric precision. The brand is most famous for creating the El Primero" in 1969, one of the first automatic high-frequency chronograph movements, capable of measuring time to 1/10th of a second. Famous models include the Chronomaster, the Defy, and various pilot's watches. Zenith is a true manufacture, developing all its movements in-house, with the El Primero calibre being its most iconic. Zenith's legacy is one of pioneering high-frequency movements and a commitment to precision."

Pusher

A pusher is an external button on a watch case used to operate functions such as chronograph start, stop, reset, date correction, alarm setting, or other complications. Pushers must fit correctly to the case and internal mechanism to work reliably. They are commonly replaced when worn, damaged, missing, stuck, or no longer sealing properly.