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fkwForgot about the Lincoln cards, they are tough, Id put them in the top 5-6
PC796 are also known as Sepia Postcards, they are fairly common.
As far as the PC799 (1919 Reds), the "World Champions" cards are very common (except the name at top variation), but the "National League Champions" cards are far far scarcer (I believe they were only issued for a couple weeks between the seasons end and World Series win).