Very cool! That was the very first scope I ever owned as a kid. It was given to me by an old guy in the neighborhood who ran a radio/TV shop for many years. I remember how heavy that beast was, particularly the thick steel case.
Used it for a few years until the power transformer HV winding shorted out.
The CRT in mine was a DuMont replacement 3AP1, but I now have a clear envelope 906 in my tube collection. A wonderful tube for explaining how a CRT works, because you can see every part of the thing!