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
FCMP Outdoor Rain Catcher 50 Gal. Brown RC 4000 Rain Barrel RC4000-BRN - The Home Depot
Seiko RC-4000 - men's watch - Catawiki
Sanyo Service Manual~RC-4000 Calculator/Radio~Original~Repair | eBay
Microdyne RC-4000 | Sales, Service, Parts & Repair
RC 4000 | PadaKuu.com
Seiko RC-4000 Watch (RARE) & RC-4400 POCKET TERMINAL RC4400 Retro Antique DATA | #274009345
Radio Comunicador Intelbras, RC4000, KIT Com 02 Radios, 26 Canais, Visor Luminoso - 4528103 | KaBuM!