Gmt Watch Kits Seiko Automatic Gmt Movements Diywatch Membership Each timepiece was designed and manufactured completely in-house, with every element subjected to rigorous quality control. The brand’s watchmakers drew inspiration from the rich traditions of Japanese craftsmanship, such as the artwork of Zaratsu sharpening, which supplies Grand Seiko watches their distinctive mirror-like end. While some Seiko watches could be thought-about luxury watches, not all Seiko watches fall into this category. Seiko's Grand Seiko line, for instance, is usually thought-about a luxurious watch brand, with prices ranging from a quantity of thousand to tens of thousands of dollars.