You pretty much named it all.
If you are wanting to restore then I'd look for something in good condition.
Check the For Sale forum and Craigslist.
Where are you located? I'm a power surfer. I'll find you all the 620s around you.
Nice reply, thanks!
My dad recommended it specifically because it fills any imperfections. My grandfather used it in Nascar.
Good thread here for future references.