3 articles with this tag
Grand Seiko just built a mechanical watch that drifts only 20 seconds a year, the latest shot in a quiet arms race over accuracy. A working dealer's read on how the chronometer ladder actually works, from COSC and Rolex's -2/+2 to Omega's Master Chronometer and Spring Drive, why for a watch you actually wear the differences are mostly bragging rights, and where the real value still sits.
There are four ways a watch keeps time, and choosing between them is really about choosing what you want from a watch. Automatic and manual are both mechanical, one self-winding and one hand-wound. Quartz uses a battery and a crystal for accuracy and convenience. Spring Drive, Grand Seiko's hybrid, pairs a mainspring with quartz regulation for one-second-a-day precision and a glide-smooth seconds hand. A working dealer's plain-English guide to how each works, the real tradeoffs, the accuracy numbers, and which movement you should actually buy.
The Grand Seiko Snowflake SBGA211 trades 33% below retail and sold faster than 95% of watches on the market in May 2026. Secondary market prices are rising as Western collectors catch on. A working dealer's read on the data, the movement hierarchy, and the one reference to buy pre-owned now.