Seiko Prospex Sumo SPB103J1

The Seiko Prospex Sumo SPB103J1 is part of Seiko's extensive and legendary diving watch collection, and has received the heavyweight nickname of 'Sumo'. Another nickname that was, perhaps more kindly, bestowed upon it was 'MM200', which is short for MarineMaster 200 (200 for the water resistance, as the Marinemaster itself is 300m water resistant). The Marinemaster is Seiko's their high-end, no limits, diving watch that has garnered an incredible amount of praise over the years for being one of the best diving watches out there. That does set the bar pretty high for a watch at around 1/4th the price. Is this watch as good as a 'real' Marinemaster? No, but it does punch above it's weightclass, regardless of being a 'Sumo. To start, it's a healthy 45mm in diameter, with a lug to lug distance of 52.6mm. That does

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