Canon RQ-1, Combined Calculator and Radio.

[Duane Hess]

I have one. Mine is the version 3 model; which has a silver colored body.

There were 3 models, the only difference from the outside seems to be the color of the body: Version 1-black Version 2-brown Version 3-silver

Have no idea if there are any internal differences. Likely not, as they are exactly the same size and weight according to:
http://www.calcuseum.com

Go to the Textual Database and look for the model.