cazalea[Seiko Moderator]
20750
That is an excellent but tricky question
I'll try to answer it this way:
Let's call "Seiko Watch" a virtual company with many facilities and brands, more than 20,000 employees and billions of dollars in annual sales..
The "Credor Team," "Grand Seiko Team" etc. in Tokyo HQ decides what they want to produce and sell, and they tap other divisions to make the watches for them.
The main producers are
- Seiko Instruments' Morioka Shizukuishi Watch Studio (north central Japan) who make fine mechanical (and some quartz) movements and assemble watches. They also do the engraving and skeletonizing on Credor mechanical movements
- Seiko Epson's Shiojiri plant contains the Shinshu Watch Studio (south west Japan) where they make mostly Spring Drive and Astron movements and host the Micro Arts studio team, who create jeweled and custom Credor cases, bracelets and complete watches
For more "on the spot" information, please read this post I wrote a few years ago:
OVERVIEW of SEIKO it's a multi-part thread and you can go on through other episodes, esp Part 2, 3, 4 & 5 (or the whole series).