fromEsquire
1 week agoGrand Seiko's Newest Diver Is Just the Right Size
Grand Seiko's proprietary Spring Drive movement combines the traditional mainspring with an electronic circuit and quartz oscillator, achieving impressive accuracy without a battery. The standard movement gains or loses approximately 15 seconds a month, while the new Caliber 9RB2 offers ultra-fine accuracy of plus or minus 20 seconds per year.
Wearables