What is the identity of the mysterious watch that appeared in the auction as 'the ancestor of Apple Watch'? - GIGAZINE
RC-4000/4400
NEW Vintage Seiko PC Datagraph RC-4000 Computer Smart Watch | WatchCharts Marketplace
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
Rare Seiko 'WristMac' Apple watch from 1988 up for auction
Memory Diary Watch (Authentic Pre-Owned) – The Lady Bag
Seiko WristMac | Apple Wiki | Fandom
HollenbackDotNet - Wrist Mac
Seiko Computer Watch Fun | Vintage Electronics Have Soul – The Pocket Calculator Show Website
Seiko RC-4000 S521-4010 PC Datagraph "Smartwatch" – Wristwatch, July 1985 - Catawiki
Vintage Seiko RC-4000 S521 PC Datagraph Computer Watch very good condition | eBay
SEIKO - S521-4010 - Databank - Vintage Digital Watch - Digital-Watch.com
Seiko RC-4000 Datagraph (S521-4010) Price Guide & Market Data | WatchCharts
Seiko RC-4000 - men's watch - Catawiki
REQUEST CASIO RC-4000 watch face - Round Custom Faces - Full Android Watch
Seiko Computer Watch Fun | Vintage Electronics Have Soul – The Pocket Calculator Show Website
SEIKO RC-4500 VINTAGE Computer Watch Gray - Rare $199.00 - PicClick
Detail
SEIKO - RC-4000 - Databank - Vintage Digital Watch - Digital-Watch.com
SEIKO RC-4000 PC-Datagraph - VERY RARE Vintage Computer Watch Set NEW IN BOX | WatchCharts
Seiko Wrist Computers - anyone know anything about them? | Vintage Computer Federation Forums
Seiko... - Vintage Flea Market and Yard Sales 360 | Facebook
Seiko PC Datagraph RC-4000 – Coolest Vintage | Retro watches, Seiko, Watch design
