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Marc S.No known sheets exist. There are quite a few cards from the T-206 set that exhibit the same printing anomaly as the card you have posted - it is seen on a somewhat regular basis.
The closest thing to an uncut sheet is the Honus Wagner Proof Strip of Five that has been sold a few times over the past decade or two. There are a lot of theories and conjecture as to how the T-206 may or may not have been printed. Obviously examples such as yours are compelling of a certain style of printing. But no one really knows for sure.
Cheers-
~ms