Seiko 5 Sports Caliber 7S36B (23 jewels) Stainless steel - Ion plated case. Flat Hardlex glass. Water resistance 10 Bars Day-date display: English / Roman figures. See thru crystal caseback With 20mm aftermarket woven fabric strap. Lugs width: 20mm Bezel diameter: 39mm Case width including crown: 42 mm Case thickness: 12.2 mm 31-20105121-W2