High standard .22

So I went shopping with my old man today, gander mountain, dicks, bass pro, cabela's; the down side to living in PA is that those stores are all with in an hour of each other so you can spend a lot of money real fast lol; and a few mom and pop sporting goods stores also. There was a High Standard Supermatic Citation in 95%+ condition with 4 mags in a used rack that my dad was looking at it and said he always wanted 1 of those so I bought for him. It was 653$ all said and done. I know nothing about the guns other than HS makes very accurate .22's and have no idea what 1 is worth.

Does any1 know anything about these guns? history value etc...?