The metal content depends on the date, as it's been changed a few times.
1858-1919: 92.5% silver, 7.5% copper
1920-1967: 80% silver, 20% copper
1968: 50% silver, 50% copper
1969-1999: 99.9% nickel
2000-present: 92% steel, 5.5% copper, 2.5% nickel plating
1967 has both the 80% and 50% silver varieties, while 1968 has both the silver and nickel varieties.
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