PropertyValue
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#value
  • Demand for Proofs was even lower than in the previous year (by more than half), and, in fact, the mintage of the Proof 1877 Twenty-Cent piece is the lowest of any date in the series with the exception of the rare, branch-mint 1875-S Proof.
http://www.w3.org/ns/prov#wasQuotedFrom
  • pcgs.com