Ron Guth:
The 1858-S Quarter Dollar has a small mintage of only 121,000 pieces. In low grades, this date can be found with little difficulty, but in high grades, the opposite is true. The PCGS Condition Census is limited to About Uncirculated grades and, unlike most other Seated Liberty Quarters, none have been graded in Mint State by PCGS. The finest example of this date is the NGC MS62 from the Richmond Collection that sold for $44,850 back in 2005.
This date shows excellent strike characteristics. The problem for collectors is finding a nice, clean, high-grade example.