Extremely unusual T206 card of Southern Leaguer Jimmy Hart of Montgomery, with a very significant factory printing error: Despite appearing perfectly normal on front, the card has a severe factory miscut and misprinted back in which the Old Mill advertisement is printed upside down. The top part of another Old Mill back also appears at the top of the card. Most of the known upside-down back examples display a portion of another advertisement. When it comes to the T206 set, which is the most highly collected of all vintage card sets, anything unusual (especially if it might in any way shed light on the mysteries of how the T206 set was printed) is of great note. This is an extremely rare and unusual printing anomaly. Encapsulated as Authentic by SGC due to being hand-cut. The card presents with bold colors and centering toward the top right, but it is in modest overall condition due to heavy creasing and rounding of the corners. The back is boldly printed. Upside-down backs are extremely rare; for context, there are fewer confirmed upside-down backs than Broad Leaf 460 examples, which rank as the fourth-most difficult advertising back within the entire set, according to T206Resource.com. As collectors have become more sophisticated, they have become increasingly appreciative of all great rarities and unusual cards associated with the landmark T206 set. This is a fascinating printing error. Value is always subjective, but in this case, because of its relative uniqueness, there is no consensus on value for this card. We are confident the auction process will provide clarity. Reserve $300. Estimate (open).