Excelsior Park Cal. JB4 family movements are recognizable due to the distinctive U-shaped cock that supports the chronograph wheels. Nearly every other chronograph uses a Y- or wishbone shaped cock or bridge. The overall design of the movement is also “reversed” from many other chronographs, with the rabbit-shaped hammer falling on the crown side and a counter-clockwise balance cock. Includes several quality specifications such as a Breguet spiral hairspring, screwed balance and machined springs. The chronograph minutes recorder is equipped with a “sautoir” (jumping mechanism). Excelsior Park chronograph movements were used by Gallet, Zenith, and Girard-Perregaux as well as in-house by Excelsior Park and Moeris watches.