For sale is a very cool vintage calculator by Hewlett-Packard model HP-22. This calculator has a production dating to February of 1976. As you can see in the photos the calculator does turn on and all the buttons register a key press, but i have not tested all the advanced functions. In the second and third picture you can see the that the second digit from the right has the upper portion of the led out. The battery carriage has been modified to accept AA batteries. Please note no batteries will be included only the plastic battery holder. Due to the vintage nature of this item it is sold as-is.