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Yes the slight curvature to the faceplate help to reduce the pincushion effect
Only the much later monochrome sets with 110 degrees would you find pincushion magnets.
So the static magnetism to the metal bell is the only cause I can see to cause a pincushion effect on an old round metal CRT. The weird thing is that from Chris's photos the pincushion looked so uniform. Which would suggest the tube at some point in it's life must have gone through a strong uniform magnetic field.
When it was shipped, did it go through a parcel scanner to determine the box's contents?
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