Seiko 5 Sports Automatic Blue Dial SRPD51K1F

The inaugural Seiko 5 watch, the Seiko Sportmatic 5, made its debut in 1963 as both Seiko's and Japan's first automatic day-date timepiece. The symbolic '5' in Seiko 5 signified a commitment to five essential attributes in every watch. Case Thickness: 13.4mm Case Diameter: 42.5mm Lug-to-lug: 46.0mm