Seiko World Time 6117-6010 for $799 for sale from a Private Seller on Chrono24
How to tell when your Seiko watch was made (Part 1)
Vintage Seiko serial number quirk | The Watch Site
HOROLOGY CRAZY: Seiko SRP461K1
My Eastern Watch Collection: Seiko Recraft Series Automatic Green Watch SNKP27 (Similar to SNKP23, SNKP25) - Welcome Home Beautiful, A Review (plus Video)
Seiko 7549 7010 with additional serial number | The Watch Site