ETA SA STP5-15

The STP5-15 is a Swiss-made automatic movement manufactured by ETA SA under the Swiss Technology Production brand. Operating at 28,800 vph with 26 jewels, it features hacking seconds and Incabloc shock protection, delivering a 44-hour power reserve. Unlike the later STP5-21, which offered Standard and Elabore grades, the STP5-15 was produced in only one official grade variant. The movement shares functional dimensions with the ETA 2824-2 and SW200-1, allowing interchangeability. STP listed the caliber as discontinued as of 2023, replaced by the STP5-21.