Very nice solid tank, a few rubs and scrapes but no rust, no dents. Bottom seams look normal with no indication of rust through. The inside looks like new. It was originally painted blue sides are black. This would be an easy restoration.
Not sure which CA Dream model, but I am thinking CA95 Benly or a CA160. It is 11.75" from the front neck area that wraps around the head tube to the back where it would hit the seat. It is 16" at its longest on the side, and 4.5" wide where it fits over the frame. Email me if you have questions about fitment for your application.