Grand Seiko Watch 36000 High Beat GMT SBGJ019. 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 and as durable as can be achieved.