The Grand Seiko Spring Drive Chronograph GMT in Titanium. Model reference: SBGC013. As a 55th anniversary piece in celebration of the first Grand Seiko watch produced in 1960, Seiko introduced this limited edition of just 400 pieces Grand Seiko sport watch. This model was the first Grand Seiko watch to incorporate ceramic into the case construction. The bezel of the watch is in “deep black” ceramic which is a material that is much more scratch resistant than steel. The rest of the Grand Seiko Spring Drive Chronograph GMT SBGC013 case is in titanium, and at its core, this is one of the brand’s older, yet more interesting sport watch models that Seiko developed in order to display the versatility of their Spring Drive movement collection. The movement is the caliber 9R96 automatic Spring Drive Chronograph GMT movement made in-house at Seiko’s Shinshi Watch Studio. Seiko Spring Drive movements are mostly mechanical, but rather than use a traditional balance wheel regulation system they use a quartz crystal regulator. The movements are still powered by a mainspring. The Seiko caliber 9R96 movement has 72 hours of power reserve and is accurate to about 10 seconds per month. That is better than most quartz movements. The movement has a lot of great functions that include the time with subsidiary seconds, date, power reserve indicator, GMT hand, and 12-hour chronograph. The layout of the dial information is unique, and while it is not symmetrical, Seiko claims that it was designed to improve legibility – especially of the chronograph. A further characteristic of these Grand Seiko Spring Drive Chronograph GMT watches is the large size of the chronograph pushers (which have screw-down locks). The watch is 43.5mm wide and 16.5mm thick. Seiko used the signature “deep blue” Grand Seiko color for the dial with gold accents for the hands and labeling. There is an 18k yellow gold Grand Seiko “GS” emblem in the automatic rotor on the movement. This watch features a sapphire crystal exhibition caseback window with a view of the very finely finished 9R96 movement. In addition to the limited edition numbering, there is a “1960 – 2015” label indicating the limited edition. The watch comes in original packaging, with a set of documents.