Tokunaga Ikuo has published a new comprehensive book on Seiko watches. It's available from Amazon.com in Japan for about $29 USD. The title roughly translates to "Seiko Watches developing special story - a secret hidden in the special technology professionals Seiko Watches". It's available now, but unless you can read Japanese, you'll only be able to look that the photos.

Link (English Translation)

New Seiko Watch Book

Thanks Seiya-San.