383 Flat Thick Oil Leather Strap a classic look for any watch. This flat, stitched watch straps is genuine calf leather, which makes it super soft and comfortable to wear. This strap is available in both black and brown. Both black and brown strap are finished with white stitching. Select the size and colour that best suits your watch. Lug/Buckle Measurements: 22mm/22mm 24mm/24mm.