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Brand: Grand Seiko Model: Spring Drive Chronograph GMT 140th te steel Anniversary Limited EditionReference Number: SBGC240Diameter: 43.8mmThickness: 16.1mmCase Material: Steel (zirconia ceramic insert and yellow gold bezel) Dial Color: BlackIndexes: Applied Lume: link NoneWater Resistance: 100 metersStrap/Bracelet: Steel bracelet (includes link an additional crocodile strap)

Later examples the MKII benefited from what Rolex learned during the early dives and had been modified with a much thicker crystal dubbed "high glass" to deal with all of that pressure. Deep Sea Special No. 3 the watch that was actually used on the record-setting Challenger Deep dive and is currently housed at the Smithsonian Institution looks quite a bit different from the MKI examples with its high glass and a link white dial. link