Vintage 1980's SEIKO RC-4000 S521 D Data Bank "Wrist Computer" New Battery | eBay
FS : Seiko vintage RC4000 and UC2000 Mint | WatchUSeek Watch Forums
What is the identity of the mysterious watch that appeared in the auction as 'the ancestor of Apple Watch'? - GIGAZINE
foone🏳️⚧️ on Twitter: "Check it out, a Seiko Wrist Terminal RC-1000! It's a watch, but it's a SPECIAL WATCH. https://t.co/737BMqceva https://t.co/mgGXNerfGY" / Twitter