Looking like skyscrapers in the distance the display gallery of defective CRT's has grown by one. In the left rear is a 465B with poor focus. Right rear a 7904 with internal HV short. Left front the 485 I just pulled with the potential arcing issue. And right front a 561B with very low emission.
You can see how the ceramic CRT technology evolved from simple angles in the 561B to more curvature in the later versions. The 561A was the first scope to get a ceramic CRT and it looks identical to this 561B CRT. They have slightly different operating characteristics due to the A having a vacuum tube PSU and the B having a solid state PSU.
I don't have a defective 2400 series CRT which would be the last ceramic CRT made but I think they look more or less look identical to the ones here.