A Liberty Seated US half dollar from the San Francisco Mint dated 1878 is rare, circulated coins start at $20,000.00 and go over $70,000.00.
Many counterfeits exist.
Assuming the coin is circulated and still in collectible condition. The 1878-S Morgan dollar is worth from $31.00-$44.00 depending on the grade of the coin.
Value depends on if it's a Walking Liberty half dollar or a Monroe Doctrine half dollar, both are dated 1923 and both have "S" mintmarks.
If the coin is a 1996-S Silver Proof Kennedy Half dollar, average retail value is $12.00 to $15.00
Retail price range for AU coins is $23.00-$30.00
A morgan silver dollar cost minimum 30 dollars but if it has a "S" or a "CC" mintmark it can sell up to 130 dollars.
Value depends on if it's a Walking Liberty half dollar or a Monroe Doctrine Centennial half dollar, both are dated 1923 and both have "S" mintmarks. Post new question.
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4 different types of 1878 Morgan dollars exist, in general values are $32.00-$77.00 depending on grade and type. Take it to a dealer or collector for a better idea of value.
In all lower values they have the same value. Is values above MS60 the 1945-S takes a higher value.
The silver proof 1997-S Kennedy half dollar has an current average value of $15.50.
Morgan dollars were minted from 1878 to 1904 and in 1921. Please check the back of your coin. You have a Peace dollar rather than a Morgan.
About $15.00, retail.