I'm an oldish guy with older friends and have dealt with this problem several times. If you have a cherished collection of something, it's very unlikely any of your heirs will be willing to put effort into finding a good home for it unless they can get significant money for it (which is also very unlikely).

You are the best person to find a recipient for your collection. Do it while you still have your wits. Strongly consider having the transfer made while you are still alive, so it doesn't have to go through probate. Don't let your heirs maintain unrealistic expectations of how much they could get for selling the stuff.