They're not silver, they're brass. The last silver dollars were made in 1935. In any case Sacajawea dollars are not rare at all, and any that you get in change or from a bank are only worth face value.
Sacagawea dollars are made of brass, not silver.
There were no Sacajawea gold dollars minted in 1990.
Sacagawea dollars are worth one dollar.
All silver dollars (1794 to 1935) had various depictions of the American Eagle. Modern (non-silver) dollar coins have several different designs: Eisenhower, Anthony, and 2000-2008 Sacagawea dollars also have an eagle 2009 and later Sacagawea dollars will have various Native American designs. Presidential dollars have the Statue of Liberty.
1979 would make it a Susan B. Anthony dollar, still worth face value.
Circulating Sacagawea dollars are only worth face value. Ditto for the new Presidential dollars.
There were no circulating U.S. dollar coins minted in the 1960s. Eisenhower dollars, Anthony dollars, Sacagawea dollars, and Presidential dollars are generally worth one dollar each. The only ones that are worth more are proofs or the 40% silver collectable Ike dollars.
The intrinsic value is $14.16 with silver at $18.31 per ounce. With silver at $47/oz, the silver value is $36.36.!!
It's possible, and likely. The value of 1920s silver dollars is directly related to the market price of silver.
Silver Dollars were minted starting in 1794. There were no silver dollars minted in 1791
The silver melt value of 820 US half dollars is $10,113.74. The silver melt value of 820 1965-70 US half dollars is only $4,135.40.
25 cents unless proof silver then 7 dollars.