For your consideration, here is a Used Casio Two Way Power Solar Battery Calculator, with case cover. It has printed on it "International Training Institute for the Sheet Metal and Air Conditioning Industry. I can not find a model number on it.

It has been tested for some of the functions, but not all. It works great. Thee is a little wear on it, but has been protected in the case. The case has a little bit of wear on it. There is a quick reference guide inside of the case. Item pictured is the actual item up for sale and comes from a non-smoking household. (106.62v-.10hc)