Probably my first .22HP.
That's not to say that they couldn't all go "poof"! I've done it before, twice. It all depends on what the item that I can't live without costs. The thing with guns is there is a bazillion of them out there, and a collection can be rebuilt. To me, the fun is in the chase. After the chase is done, and I won, that which I won often loses its luster and I find myself thinking of the next chase. It's been that way with guns, cars, and women. You want to see a big Savage/Winchester/Mauser/Springfield sale, just dangle a nice 1948 MG-TC in front of me...
