Junghans J645-85

Junghans caliber J645-85 is a quartz chronograph movement based on the Ronda 3520.D, found in the brand's Form C line of chronographs. It features a 30-minute counter and hacking seconds, allowing the seconds hand to stop for precise time-setting. The battery (type 384) lasts approximately 54 months under normal conditions, and pulling the crown engages a power-saving mode that reduces consumption by about 70%. Unlike in-house calibers, this movement is assembled from Swiss parts rather than manufactured entirely by Junghans.