...is to ask a trusted watch buddy to supervise the sale of my pieces first to my collecting friends, then through the PuristS CM (and as needed subsequently through channels such as auctions). Proceeds to go to my trust, which first pays life income to my wife (assuming that I go first) and then upon her passing to my designated charities.
Don't tell my closest watch pals, but I have also thought pretty seriously about leaving a piece to each of them...
I guess I shouldn't be surprised that others think about these things!
Best,
Gary G