Limited edition of 500 pieces grand seiko watch mechanical hi beat 36000 gmt limited editionsbgj021 seiko watch corporation is pleased to announce its first ever hi beat gmt it has all the features of the existing caliber with the addition of a 24 hour gmt hand with easy hour adjustment every grand seiko watch showcases the pure essentials of watchmaking with craftsmanship and high technology manufacturing being harmonised to create watches that are as accurate as legible as comfortable