OverviewGrand Seiko is a luxury brand that offers timepieces made by master craftsmen in Seiko's two exclusive watchmaking studios, using exclusive movements and the highest grade materials. A Seiko 5 watch can last anywhere from five years to over 25 years. The wide range is due to a variety of wildcards. For example, dust build-up can eventually cause a break in an old Seiko 5's 7S26B movement. However, this will likely take decades.0Each Grand Seiko watch is instantly recognizable because of its simplicity of form and its understated elegance. Grand Seiko has always been distinct in its design, character, presentation and, more recently, its calibers. In order to further reinforce its unique appeal and to reach out to a wider audience, it was decided to take one step further and presenting Grand Seiko as an entirely separate brand. Practicality and durability are vital attributes of all the best sports watches and are also core values of Grand Seiko which has demonstrated a consistent commitment to the pure essentials of watchmaking. Today, the watches are highly sought-after on the pre-owned market. The rich history, timeless design, and incredibly innovative movements make this watch, and Seiko generally, unique in the world of watches. Most importantly, however, Seiko is special because its fans have a personal connection to their timepieces. The Seiko movement and model number can be found on the caseback in two sets of 4 digits joined by a dash. The first 4 are the movement calibre number, the second four are the case/model number. Also engraving is neat, evenly spaced, aligned and features sharp edges