For your consideration, here is a Vintage Lloyd's Accumatic 20 LED Calculator, serial number 10-28923, with case, made in Japan.  It had some corrosion in the battery compartment.  I cleaned it out and neutralized it with some water and baking soda.  I could not get it to work.  It has some wear and a few spots on the display.  There is an A marked on the back of it.  Item pictured is the actual item up for sale and comes from a non-smoking household.  (168.63u-.13hc)