Tested and working

Brand: Hewlett-Packard

Model: HP-15C programmable RPN scientific calculator

Vintage HP Voyager-series calculator with horizontal landscape layout and ten-column keyboard

Color: Black body with brushed silver metal top trim

Country/Region of Manufacture: United States

Details: 10-digit LCD display, Reverse Polish Notation entry system, programmable functions, matrix and complex number operations, statistics and integration features, gold and blue secondary key functions, on-board reference and function guide printed on the back panel

Included: HP-branded black slip case and installed button cell batteries

Keywords: vintage HP calculator, HP 15C, RPN scientific calculator, programmable calculator, made in USA