The origin of 'wearable computer' was in Japan in the 1980's - GIGAZINE
My grandfather's Seiko RC-4000 watch from 1985. The "most advanced, hight tech" watch for its time that connected to the Apple II computer. : r/BuyItForLife
Seiko Wrist Computer UC-2000 UC-2100 Keyboard Digital Working Mans Watch Vintage | eBay
JAPAN: TOKYO: SEIKO LAUNCHES NEW WRIST WATCH COMPUTER - YouTube
Seiko Originals: The UC-2000, A Smartwatch from 1984 – namokiMODS
Before Smartwatches, There was the Seiko UC-2000 Wrist Computer, Here are 5 Cool Facts - TechEBlog
Seiko Quartz Diving Computer Digital Men's Watch STN009J1 | Watches for men, Seiko, Dive computers
SEIKO UC-2000 LCD WRIST WATCH computer set with UC-2100 keyboard RARE VINTAGE | eBay
Seiko Originals: The UC-2000, A Smartwatch from 1984 – namokiMODS
RARE Mint condition Vintage gold plated 1984 SEIKO UC2000 UW02 LCD computer w. | eBay