How do I remove an old fake mortise door knob?

I have a door knob on my front door that is an old fake mortise door knob. I unscrewed the two screws from the stem of the knob from both sides of the door. Now I cannot get the knobs off. I have tried unscrewing them, pulling, and prying.

Any suggestions?

Thanks.
Whacking it didn’t seem to do anything…

If it is that old and has been bake on then smack it with a hammer a few times

Paper mario and the thousand year old door part 1

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