STP, which stands for Swiss Technology Production, was founded by the Fossil Group in 2008. The same company that makes the cheap quartz watches you, or at least some of your friends, probably owned in high school low-key runs one of the most underrated movement manufacturers in Switzerland.
I can personally attest to STP’s quality because one of my favorite watches is my Zodiac Super Sea Wolf powered by an STP caliber 3-13. Zodiac is owned by the Fossil Group, meaning that it technically uses in-house movements.
Most of STP’s movements are based on expired ETA patents, and the production quality is on par with that of the Swatch Group-owned manufacturer.
STP also supplies movements to brands outside of the Fossil Group, like Van Speyk. While it isn’t nearly as prestigious or popular as fellow Swiss movement brand Sellita, it offers a similar quality product for a cheaper price.
Along with the moon phase, small seconds and power reserve indicator, the STP caliber 2-12-63 has a 42-hour power reserve and a Nivaflex non-magnetic hairspring. A custom-finished and signed rotor is visible through an exhibition case back.