Nice and lucky. Not long ago I found a 2011 Proof Dime in a coin roll. It was in perfect condition. There is a lot of good stuff out there.
1963 and doesn't appear to have circulated much. Probably liberated in the recent past by someone who didn't know or didn't care what it is.
Dig it I almost bought a 63 UC mint set today. I can't believe that grey sheet values them at $47. Nice find.
That's a tasty one. The only proofs I have found, have been in a Coin Star, and coin roll hunting quarters.