Definition
Grand Seiko is both a line of watches and the corresponding chronometer specification from Seiko. More rigorous than the COSC spec, it calls for
(Table credit Harry Bishop and WatchUSeek)
The watches
- Katsu Higuchi sells them (here, actually)
- So does Seiya Kobayashi
- GMT+9 has several GS articles
- A nice collection with history and details
- Seiya Kobayashi's private collection is seriously drool-worthy.
