About: http://webisa.webdatacommons.org/209834191

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	Proof examples of the coin, which were included only in US Mint issued proof sets, were struck at the San Francisco Mint and carried the ???S??? mint mark.
http://www.w3.org/ns/prov#wasQuotedFrom	kennedyhalfdollars.net