The T137.407.11.351.00 (T1374071135100) features a tonneau/barrel-shaped stainless steel case measuring 40 mm in diameter (approx. 39.5 mm across), 10.9 mm thick, and equipped with a see-through caseback to admire the movement. https://saicreationswatches.com/products/t1374071135100-tissot-unisex-t-classic-watch-for-men