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 technology has changed global dive watch standards. This timepiece is a modern re-interpretation of the 1978 diver with its unique case construction. This model is a more compact version than the orginal - until now it has been difficult to produce a smaller style for everyday wear and recreational diving. With this new iteration, Seiko invented a technique to retain the outer protector whilst reducing the case depth to just 11. 5mm and the diameter to just 46. 7mm, creating a watch for every occasion. Solar-powered, the watch charges from natural and electric light. The accordion-style silicone strap combines high durability and comfort - a strap design invented by Seiko as a practical solution to the expansion and contraction of a diver's wrist at different depths. The watch shape is affectionately nicknamed by Seiko fans as a ‘Tuna’ - because of its larger diameter and bold shape like a tuna tin - loved for decades since its 1975 release.