Silver dollars were made from 1794 to 1935 at 5 mints (with some gaps in production) so that's a very broad question with hundreds of coins selling for 6 and 7 figure prices.
To name just a few, showing prices for top-quality coins as of 01/2011:
1896 S - $500,000
1895 O - $662,000
1895 - $560,000
1893 S - $1,150,000
1870 S - $1,230,000
1839 - $250,000
1799 - $331,000
1795 - $400,000 to $560,000 depending on variety
and the champ of them all is the "1804" dollar, actually struck in the 1830s but as an official Mint issue. The top price for one of these has been over $6 million.
U.S. silver dollars dated 1935 or earlier contain 90% silver.
There is no doubt that the 1933 Saint-Gaudens Double Eagle is the most valuable US coin. One of these coins recently sold at auction for over 7 million dollars.
All US half dollars dated 1964 and prior are 90% silver (worth about $11 in scrap silver) All US half dollars dated 1965-1970 are 40% silver (worth about $5 in scrap silver) All US half dollars dated 1971-present that are circulating contain no silver and are only worth 50 cents. (The US does strike commemorative half dollars and proof silver half dollars for collectors but these are almost always found in mint packaging, not as a loose half dollar).
There were no silver dollars made in the US in 1946.
1922 is one of the most common dates for US silver dollars. They currently sell for around $20-$25 each.
US Trade dollars have more silver in them than Morgan dollars do. But in general the Morgans have higher values.
What is the most valuable
U.S. silver dollars dated 1935 or earlier contain 90% silver.
There is no doubt that the 1933 Saint-Gaudens Double Eagle is the most valuable US coin. One of these coins recently sold at auction for over 7 million dollars.
Most common Morgan silver dollars are worth around 20 to 40 dollars in lower circulated condition. See the link below for a price guide and then you can see common Morgan silver dollars.
The term is actually "coin silver". In the US it refers to the alloy of 90% silver and 10% copper that was used up till 1964 for dimes, quarters, and half dollars, and up till 1935 for dollars.
No. The US has never and will never make pure silver dollars.
There were no silver dollars made in the US in 1946.
All US half dollars dated 1964 and prior are 90% silver (worth about $11 in scrap silver) All US half dollars dated 1965-1970 are 40% silver (worth about $5 in scrap silver) All US half dollars dated 1971-present that are circulating contain no silver and are only worth 50 cents. (The US does strike commemorative half dollars and proof silver half dollars for collectors but these are almost always found in mint packaging, not as a loose half dollar).
August 1, 2009 There can be no doubt the most valuable US coin is the 1933 Saint-Gaudens Double Eagle. In recent years an example of this coin sold for over 7 million dollars.
No, the US didn't make any silver dollars in 1932.
The US didn't make any silver dollars in the 1960s.