IWC Schaffhausen 51950

The IWC 51950 is an in-house automatic chronograph caliber introduced in 2017, belonging to the 51xxx family. It features the proprietary Pellaton winding system, which IWC has refined over decades for reliability, paired with a 7-day power reserve—a notable achievement for a chronograph movement. The caliber remains in production and serves as the base for contemporary Portugieser Chronograph models.