[slidertogrid]

Hi, Welcome to the forum! The fault you have is in the frame stage. There may be other faults once you give the set some signal.
To be honest it is fairly remarkable that you have anything on the screen at all if the set is unrestored .
Most if not all of the wax capacitors will need replacing they will be (electrically) leaky.
The capacitors being leaky are almost certainly what is causing the frame fault.
It would be best to get a circuit diagram for the set then you can identify the wax capacitors and get some suitable modern replacements.
Plenty of advice and help on the forum as you go.
The Tube looks fine the display looks bright and in focus. the signs of a worn tube are usually a dim display or the brighter parts of the picture (highlights) going 'silvery' or out of focus.
It would be helpful to know your level of experience as far as restoration is concerned.
There are some precautions to take when working on a old TV set, High vacuum CRT, EHT and live Chassis to name a few... but there is little point in bombarding you with information that you may already know.
Good luck with the set it will provide hours of fun!
Rich.