Ron Guth: This interesting variety was created when the three-digit 186 logotype was punched into the die UPSIDE DOWN, then corrected. The undertype is clearly visible, making this one of the most dramatic varieties of the series. The 1865-S over Inverted Date $10 is about twice as common as a regular 1865-S $10, but that is a relative term, since any 1865-S $10 is rare. The single Mint State example (PCGS MS64) was recovered from the wreck of the S.S. Brother Jonathan; apart from that important condition rarity, collectors must settle for a handful of AU pieces near the top of the Condition Census.
S.S. Brother Jonathan shipwreck - Bowers & Merena 5/1999:49, $115,000