Ever since it was created in 1968, the Seiko 5 Sports collection of mechanical watches has been synonymous with durability and reliability. Today the collection takes another step forward with, for the first time, the introduction of a GMT caliber. Based on the tried and trusted platform of Seiko's 4R series calibre, this new Sport reference offers the added convenience of a quick-adjust second time zone display in a stainless steel case that's only a whisper 0.1 mm thicker than the three-hand Seiko 5 diver.