The horn is a mixture of copper body tube, brass posts, thumb rest, key guards, and nickel or nickel plated neck and bell. The neck appears to be nickel plated, but the bell is difficult to say. It's difficult to scratch though nickel plating to see what's underneath. The inside of the horn had a thick green verdigris common to copper and it extended down onto the nickel bell (which appears nickel inside and out). I didn't think that nickel could be worked into a bell shape, but the advertisements for the Holton Super Collegiate Trombone (still being made) and the Holton Super Collegiate Trumpet say that they have solid nickel bells. Difficult to say on this one.
The case appears to be the regular Collegiate case. Or is it a Super Collegiate case? As you can see, it's also a three-tone.