You can get coins that have a fully documented history from a shop.
I've got one that I am reasonably certain as to whose hands it has been in since it was given by Elizabeth I.
PC's Rawlins Oxford crown, we think has a fully documented history back to Sir Henry Gage, Governor of Oxford who was killed in an attack on Bletchingdon House in January 1644/5. I'd say both those were pretty personal, and not just a dream.