Hard to believe but this calculator is 33 years old.. from 1982.. and still working as good as new ..complete with instruction leaflet. Wish I could say I had owned it from new.. bought it on ebay for a fiver.. they are becoming collectable.. I bought my very first pocket calculator in S Africa.. about 1974.. Red LED display.. it got melted by the sun while sitting on the car dashboard .. I love 'old tech' can't bear to see it scrapped .. I have a couple of old laptops from the early part of this century.. a Dell from 2006, a Mac Powerbook g4 17" from 2005 .. both working.. Do you have any 'old tech' still working ?.. Casio LC-402 Casio Computer Co. Ltd. Date manufactured: 1982 Made in Japan.