I have been pretty lucky in finding some in excellent condition for their age but I am kind of picky and ask questions so I know what I'm getting. Like this one, I was surprised it was as nice as it was.
You really asked the right questions, but probably got lucky, too.
I had a '61 Gretsch I was going to check out and when I found out that was not owned by a guitar player, but somebody who gave up on it and closeted it for decades, I had to check it out. Wow.
Where many old Gretsches have the neck pulling up, and resulting high action due to type of glue they used for neck joint which fails after twenty or so years, this guitar was pristine. It still had original flatwound replacement set of strings in soft shell case which was surreal, and I think some of the tags/receipts. It also didn't have the typical finish checking as almost any really old guitar should have and looked like basically a late reissue.
Right now my neighbor who can't play anymore due to issues has a nearly mint 70's Gibson RG I may want to buy from him. It's not my favorite model per se but it's hard to pass on an unplayed guitar of any brand that also has twenty or thirty years on it.
Finding perfect guitars is kind of a fun game and when I hear of somebody who has one who never played it, as getting into band was the thing to do in '60s and '70s, I want to be the first to see it. The only problem is that some of those are so pristine they will only dive in value if played and slightly damaged. A well worn 1959 Les Paul Standard is maybe $140,000 dollars but one that has never seen any fading and still has that deep strawberry red sunburst can fetch $300,000 dollars. While I don't like old guitars with the plastic still on the pickguard (I would usually tear it off) I will now keep that on if I chance upon it again. Seeing what the usually common sticker laden 1990s Epiphone goes for with (Gibson USA sticker, alnico special sticker, Gibson USA factory setup sticker, and of course plastic on pickguard and pickups), I will probably get one and baby it and leave all those ugly stickers alone.
Are you the guy with the acrylic case in music room? Anyway, that JS
is a great candidate for it.