The SBGH205 is the reincarnation of the legendary 1960s Grand Seiko Hi-Beats. Those watches defeated all comers in accuracy competitions and secured Grand Seiko's place as a legendary movement maker. Today the Hi-Beat uses an all new movement, the 9S85 which beats 10 times per second to create an ultra-smooth seconds hand, and of course, better than chronometer accuracy. Furthermore, the SBGH205's 9S85 uses highly advanced MEMS technology to create the most precise metallic components in the industry, smooth almost down to the molecular level. In house proprietary SPRON alloys for both the hairspring and mainspring allow for an industry leading 55 hour power reserve, one of the longest power reserves of a high-frequency watch ever made, as well as a more stable hairspring for improved timekeeping. The SBGH205 also comes in a great modern size, 40mm, and features a display back so you can admire the beautiful in house movement.