Starting last summer, in order to better play "Follow the Lead Picture" post, I began to try and fill in date "holes" in my run of US coinage from 1794 - 2017. (Note, this just means, at a minimum, to try and have at least one coin from each date). Needless to say it's still VERY much a work in progress for the earlier years. Here's a Jefferson I picked up last summer to fill in a date hole. So, what is Tom saying, or is he just blowing smoke? The images are by Bob Campbell, and I think he did an excellent job.
I can't recall the exact verbiage , but something like " distinctive, natural, rare snowflake breath toning! One of a kind !!( we think)
Modern proofs do....some of the older dates were supposed to but depending on the rev. Die that could go one way or another .