What are your keepers?

I previously posted this in the Sentimental yoyos thread, but now I realize that my day’s old butterfly is really the one that I don’t want to lose most (I can’t even bring myself to change the string). It is at home in my “yoyo box” (a carboard box that says yoyos on it) with other yoyos I probably don’t want to lose either, simple but sentimental stuff like old tin yoyos and the ones that come with candy inside. In a way I started collecting yoyos before I started yoyoing, and personally I like that kind of collecting better than the how much is it worth type because 99% of what’s in that box at home is priceless to me.