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Given the jaggedness of the edge it looks to be on the edge of loosing sync...It all looks like symptoms of the AGC being set for too much gain and possibly mis-adjusted fine tuning.
If it were perfectly synced and fine tuning were set for optimal detail I'd ask you to put a meter on the focus line and run the control through it's range....If your set uses a focus divider off the 25KV HV line like my earlier 12B13C52 those will sometimes drift a bit...I solved mine by adding resistance on the correct side of the focus pot to bring it back into range...Drifted back out twice in a ~year then stabilized long term after the last adjustment.
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