"Aside from its carbon fiber case, the other most noteworthy detail about the new forged carbon Tissot PRX Powermatic 80 is the updated movement fitted to the model. Just like all of Tissot’s other entry-level mechanical watches, the new forged carbon PRX is powered by the brand’s Powermatic 80 automatic movement, which is based upon the core architecture of the ETA 2824, although it runs at a lower frequency of 21,600vph (3 Hz) and offers a longer power reserve of 80 hours. However, unlike the standard Powermatic 80 movements that feature Nivachron hairsprings, the new forged carbon PRX uses the same movement that can be found inside the Tissot Gentleman, which features a silicon hairspring indicated by a small “Si” engraving on the upper surface of its balance bridge."
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