The T137.407.21.031.00 (T1374072103100) sports a tonneau-shaped 316L stainless steel case with rose-gold PVD coating, measuring approximately 40 mm wide and 39.5 mm long, with a slender thickness of 10.9 mm https://saicreationswatches.com/products/t1374072103100-tissot-unisex-t-classic-prx-powermatic-80-watch-for-men