1903 O. I bought myself an early Christmas present. I've narrowed down to further completing a full series set (which will never happen for all mint marks) to just a few key dates remaining. No reason to buy raw coins and play the lottery with those anymore. I will continue to pick up nice raw coins at bargain prices if available, even if duplicates of what I have. You can never have "too many". But no more gambling on high valued coins on a whim and a dare.