Prospex 'Sumo'This watch shape is affectionately named Sumo by Seiko fans because of its size and shape and the 12 oclock marker its a substantially strong looking timepiece. LumiBrite hour markers and hands increase legibility even in low light. Seiko Prospex watches are designed for sports lovers and adventure seekers in the water, in the sky or on land. Since launching Japans first divers watch in 1965, Seikos innovative watchmaking has changed global dive watch
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