DESCRIPTION Prospex Street series was developed to combine looks and substance: coupling Seiko fans’ enthusiasm for watch design styles alongside the expertise from 5 decades of creating diving watches. The retro ‘tuna’ shape from the 1975 divers’ model has been channelled into an even more compact yet reinforced watch, robust enough to dive 200m under the sea but stylish enough to be worn on the street. The watch shape is affectionately nicknamed by Seiko fans as a ‘Tuna’ – because of its larger diameter and bold shape like a tuna tin.Solar-powered, the watch charges from both natural and electric light. The accordion-style silicone strap combines high durability and comfort – a strap design invented by Seiko in 1975 as a practical solution to the expansion and contraction of a diver’s wrist at different depths. Seiko Prospex watches are designed for sports lovers and adventure seekers whether in the water, in the sky or on land. Since launching Japan’s first diver’s watch in 1965, Seiko’s innovative watchmaking has changed global dive watch standards. Movement Caliber Number: V131Movement Type: SolarAccuracy: ±15 seconds per monthDuration: Operating for approx. 6 months (when fully charged) Exterior Case Material: Stainless steelCrystal: HardlexLumiBrite: Lumibrite on hands, indexes and bezelBand Material: Silicone Other Details Water Resistance: 200m / 660ft diver's Case Size Thickness: 10.4mmDiameter: 38.7mmLength: 40.4mm Weight: 64.0g Other Specifications Screw case back Screw-down crown Unidirectional rotating bezel Other Features Overcharge prevention function