Limited edition of700 pieces grand seiko watch mechanical gmt limited editionsbgm029g the first ever hi beat masterpiece built by the japanese watch making experts to include a gmt zone the grand seiko mechanical gmt is a limited edition of 700 pieces and comes equipped with an easy hand adjustment celebrating the launch of a new caliber the brand have taken the 9s66 movement with 35 jewels 510 mainspring and 610 hairspring to make a new durable movement which offers 72 hours power reser