Grand Seiko's Sport line is enriched with two professional divers, water-resistant to 200 metres. Both beat to the rhythm of the Hi-Beat 9S85 calibre, a hand-wound mechanical movement with a frequency of 36,000 vibrations per hour, boasting an accuracy of +8 to -1 seconds per day and a power reserve of 55 hours. The difference between the two concerns both the material used for the case and bracelet and the colour of the dial: the steel version has a dark blue dial with silver-coloured details, including the Grand Seiko logo at 12 o'clock; the titanium version, a material that guarantees remarkable resistance to scratches and corrosion as well as great lightness, is characterised by a black dial with the brand's logo at 12 o'clock in a gold tone. Both timepieces display a date window at 3 o'clock, while the screw-down caseback bears the lion emblem, Grand Seiko's iconic symbol. They also offer optimal legibility both at night and in the depths of the sea thanks to the use of Lumibrite applied to the indices, hands and unidirectional rotating bezel. Each hand has a different shape to ensure that the time can be read easily, and the triangular indicator at 12 o'clock provides greater security of vision even in the depths. Prices: 7,200 euros (steel); 8,600 euros (titanium).