There has not been a year in which the US Mint issued only 20 silver dollars. However, in 1884 there only 10 proof Trade Dollars issued and in 1885 there were only 5 proof Trade Dollars issued.
No US silver Peace dollars were issued in 1929, this the only year in the 1920's they did not strike them.
1970 was last year of (40%) silver half dollars but they were never released for circulation and only issued in 1970 Mint sets.
All silver dollars issued from 1794 to 1935 carry a picture of Miss Liberty, as in "Statue of ..."
The last year that 90% silver coinage was issued for general circulation was 1964. Kennedy Half dollars were struck in 40% silver from 1965-1969.
1893 was the last year Morgan dollars were issued from the Carson-City Mint.
The last year for circulating silver U.S. quarters (and dimes) was 1964. Half dollars contained silver until 1970, but at a reduced amount.1964 was the last year silver quarters were issued for general circulation.
The last 90% silver half's made for general circulation were in 1964. 40% silver coins were issued until 1970.
So far 2009 was the only year no Proof Silver Eagles were issued.
1935 for circulating dollars. Then in the 1970s, some Eisenhower dollars contained silver, but those were only for the collector market.
They have never been all silver, but dimes, quarters, half dollars and silver dollars made before 1965 are 90% silver. The plain and simple answer is: 1964 was the last year
They were first issued in 1886.
They were first issued in 1886.