Vintage 1970s National Semiconductor 4510 mathematician calculator with red display. With original box and manual included. Tested and working. Box does show some regular signs of aging, mainly the flaps that come out of the box when removing the calculator. Original manual included. Excellent condition, no missing or torn pages no writing or marks. Smoke & pet free home. Free gift included with purchase! Nationalsemiconductor Calculator Vintagecalculator 1970s Vintage Mathematician Mathematics 70s Math Education Educational Teaching Collectible Rare HTF Hardtofind