HP 11C compact RPN scientific calculator. This is one of five compact "Voyager" models initially made in the early 1980s. The 11C was not made after 1989, so t…
HP-11C Scientific Programmable Calculator - complete with - Catawiki
HP 11C Scientific Calculator
Hewlett Packard HP 30S Scientific Calculator Choose 1 Black or 1 purple | eBay