It is electromagnetic deflection and electrostatic focus and the base pinning resembles a period monochrome TV CRT, but beyond that, there isn't much to tell. The part number is WX32320PX55.
Note the face is specially made, molded with a raised strip of glass, and another glass strip bonded to that, to form a display area about 1/4" tall by perhaps 8" wide. The phosphor type is not known. Px55?
If anyone has the datasheet on this beautifully made instrument, I'd appreciate a copy. The real story here is that the tube is used to scan one line at a time in a moving-film recorder. The film is moved over the face and the image is drawn there a slice at a time.
Beautifully made, no? Thanks for looking!