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 diver’s watch was orignally sold in Japan only. Affectionately christened the ‘Sumo’ by Seiko fans - because of its size and shape and the 12 o’clock marker – it’s a substantially strong looking timepiece.