Before doing anything, I would test that CRT. If it's a dud, a replacement could cost $100 or more.
If you don't have a CRT tester, this article describes how to do a simple dud/not-dud test on the filament with an ohmmeter:
http://antiqueradio.org/FirstStepsInRestoration.htm
If the CRT passes the dud test, it may still have weak emission, but you need a CRT tester to evaluate that. Chances are decent that it would work well enough to complete the restoration, even if the picture is dim.
I'd sell it as-is, or else restore it and plan to keep it forever, as init4fun suggested. This is not a particularly easy TV to work on, and restoration will mean a lot of work, even if you're experienced with old tube TVs. The market for restored TVs is very limited. It is risky and extremely expensive to ship one, which may limit you to local buyers. And if you sell a "restored" TV to someone who knows nothing about vintage TVs, they may have unreal expectations about how well it will work compared to a new flat screen.
Phil Nelson
Phil's Old Radios
http://antiqueradio.org/index.html