1968 Super Blackhawk, I bought it used in maybe 1979. Previous owner was a former Alaskan fur trapper who used it up there before moving back to CO. I got it from the local gun shop owned by the father of my girlfriend at the time. Shop guy said he told the first owner that it didn't look like he used it much. Trapper took offense to that and said he used it ALL THE TIME and must have put at least 50 rounds through it!
I had others before that either my dad or I sold/traded. Dad sold my .410 single shot Spesco shotgun after asking me whether I wanted it - I did not - when I was living in MN. And I sold or traded off a few that I bought before that first Super Blackhawk, including a S&W model 29.
Technically, I have had my dad's single shot Stevens .22 rifle that his dad bought for him for $3 during the depression for longer, except I don't recall my dad ever technically "giving" it to me. I kept it in my room and took care of it, shot it often as a kid, but I never took possession of it until my mom gave me all of dad's guns after he died. When he was a boy, he wrote his name on the stock in silver model paint and that remains on it to this day.
EDIT: My mistake, the above single shot .22 is not a Stevens... It is marked as a Springfield Arms model 53A (made by Savage if I'm not mistaken, but Savage owned Stevens as of 1920). Had I looked at the rest of the pics I have of it, I would have seen this one: