Seiko Prospex Padi Collection Japanese Mechanical Watch With A Grey Stainless steel Bracelet Strap, 45mm Case With Unidirectional Bezel & A Green Coloured Dial & Date Window. One of Seikos nicknamed models, the Sumo has a traditional look compared to many of the Japanese brands often quirky dive watches.Suberbly constructed with small details like its handset and bezel markings, as well as in more substantial ways, such as its case shape and 4 oclock crown. Automatic with manual winding capacity, Lumibrite on hands, indexs and bezel, Screw case back, Screw-down crown, Unidirectional rotating bezel. > Diameter: 45 mm Weight: 188.0 g Screw case back Screw-down crown