About: http://webisa.webdatacommons.org/134358401

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	Hairlines are the most common reason why gold coins are downgraded in proof to perhaps Proof-63 and Proof-64 instead of Proof-69 or Proof-70.
http://www.w3.org/ns/prov#wasQuotedFrom	goldprice.org