The 1863 Quarter Eagle is extremely popular with collectors because it is a Proof-only issue and, thus, the only option available to anyone seeking a Quarter Eagle of this date from the Philadelphia Mint. With a mintage of only 30 examples, this date creates excitment whenever it appears on the market.
Probably half of the original mintage survives. I know of thirteen demonstrably different examples, including two circulated examples and two in the National Numismatic Collection at the Smithsonian Institution. Most examples are cameos, though there are several that were certified before PCGS recognized the Cameo designation and which would receive either a CAM or a DCAM designation upon re-examination.
The finest 1863 Quarter Eagle is a PCGS PR66DCAM which sold for a record price of $195,500 in 2012. It currently reposes in the Simpson Collection.