Matches in DBpedia 2014 for { ?s ?p * 1964, silver proofs 1992–present with S mint mark: 90% silver, 10% copper. * 1965–1970, some 1776–1976 issues: outer layer of 80% silver, 20% copper surrounding core of 79% copper, 21% silver, totaling 60% copper, 40% silver. * Circulation strikes, 1971 to present: outer layer of 75% copper, 25% nickel surrounding core of 100% copper.. }
Showing items 1 to 1 of
1
with 100 items per page.
- Kennedy_half_dollar composition "* 1964, silver proofs 1992–present with S mint mark: 90% silver, 10% copper. * 1965–1970, some 1776–1976 issues: outer layer of 80% silver, 20% copper surrounding core of 79% copper, 21% silver, totaling 60% copper, 40% silver. * Circulation strikes, 1971 to present: outer layer of 75% copper, 25% nickel surrounding core of 100% copper.".