The T1374101109100 stems from the PRX line, a neo-retro revival of Tissot’s 1978 integrated-bracelet design. The "PRX" stands for Precise, Robust, and Roman numeral X (10) for its 10-bar water resistance. https://saicreationswatches.com/products/t1374101109100-tissot-unisex-t-classic-prx-analog-watch-for-men