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I think it might be a 12" round tube with a mask making it about 10" diagonally . the dark spot it just dirt or crud between the tube and outer safety glass , the two surfaces almost touch at that point, trapping gunk. it has 4 uhf style jacks two are labeled vert and Horiz., not sure what the other two are for. my photo of those didn't turn out well.
Next time I go there I will try to get better pics and see what picture tube is in it.
the front panel reads GE Closed Circuit television. It came from an engineering school. this unit doesn't really have a big enough screen for classroom use, so it may have been used for something else. If it is from 1957, bigger monitors would have been available . i dont suspect it was for X-Y display, since it has vertical and horizontal frequency controls inside, so that must be a regular raster I presume.
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