Got a friend with an old High Standard Sentinel, 6 inch barrel, blue finish, .22 LR. Despite its age, it has had under 100 rounds through it, bought, tried, then was oiled and put away. I wanted one of these when I was younger (and they were still manufactured). I don't need a .22 revolver, but since he wants to sell it I'm wondering what it may be worth, if they break often enough that I would have to worry about parts, etc. I saw a nickel 4 inch in Gunsamerica @ $275, thought that was a bit high. Thanks for any info.