![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 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](https://i.redd.it/m4v9d27amg441.jpg)
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
![1977 Hewlett-packard HP-01 Calculator Watch in Original Box-vintage 1977 Men's Calculator Watch - Etsy 1977 Hewlett-packard HP-01 Calculator Watch in Original Box-vintage 1977 Men's Calculator Watch - Etsy](https://i.etsystatic.com/21384877/r/il/965ab3/3383351870/il_570xN.3383351870_nq02.jpg)
1977 Hewlett-packard HP-01 Calculator Watch in Original Box-vintage 1977 Men's Calculator Watch - Etsy
![HP on X: ".@eBay find: a $14,500 HP-01 digital watch calculator from the #70s #TBT http://t.co/lhMbTZ1AcY http://t.co/jSrZu9VPqw" / X HP on X: ".@eBay find: a $14,500 HP-01 digital watch calculator from the #70s #TBT http://t.co/lhMbTZ1AcY http://t.co/jSrZu9VPqw" / X](https://pbs.twimg.com/media/BvBZOhvIAAANbbP.jpg)