Vintage Radio Shack Pocket LED Calculator, Model EC-375, Catalog Number 65-615, Made in Japan, Circa 1975
Image by France1978
From the Vintage-Technology.com Website: Well-built calculator with typical 70s colouring and some nice period design points. The logic is very poor with negative zero bug, pseudo fixed decimal bug, zero square root bug, lack of input overflow suppression and no overflow recovery at all. Well done guys – you’ve got the lot!