Hewlett Packard HP-71B BASIC Computer/Calculator in good used condition.
I am not able to test all functions, however the display and all tested keys appear fine.
Manuals and other info easily available online, such as this reference manual https://hpmuseum.net/document.php?hwfile=2039, and some good YouTube videos too, eg HP 71B Pocket Computer from 1984 (youtube.com)