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fkwIve seen a few unique (one of a kind) cards. Mainly the 1921 Herpolshiemer (E121) cards. Ive sold 2 and seen another 2 in last couple months.
There was also a Clarks Bread (E121 style) a couple months back and vertical back Witmor Candy (E121 style) a couple days ago, which are both very rare.