Prototype of HP's first calculator watch can be yours for $14,500
HP made a smartwatch in 1977, and you can buy a prototype for $14,500 - The Verge
Hewlett Packard HP-01 Calculator Watch - Working Perfectly
1977: The HP-01 calculator watch can calculate dynamically using time as an argument. The user can watch as the cost of their international call increases on the display. : r/RetroFuturism
File:HP-01 Calculator Watch.jpg - Wikipedia
Hewlett-Packard Calculator Watch | Pawn Stars: The Game Wiki | Fandom
HP 01 - Calculator LED watch - 1977 - Catawiki
Vintage 1977 Hewlett Packard HP 01 Calculator Watch. SOLD | afinewatch.com
Hewlett-Packard, HP-01, Calculator, wristwatch, 41 x 36 mm. - Bukowskis