Check that coin again. If it's dated 1896, then that's a Morgan dollar with an image of Liberty on the front. The Susan B. Anthony dollar wasn't introduced until 1979. The mint mark on a MORGAN dollar is on the reverse side, near the bottom, just above the letters "do" in the word "dollar."
The coin is a DOLLAR not a half dollar, the mintmark is just above her shoulder on the left side on the front of the coin.
On Susan B Anthony dollars the mintmark is to the left of Ms. Anthony on the obverse. There may also not be a mintmark. That means it was made at the Philadelphia mint.
The Redbook of United States coins lists the grades and gives guidelines on how to determine those grades.
The coin is a SACAGAWEA dollar NOT a S.B.A. dollar. 1999 was the last year for the S.B.A. coins. 2000 is the first year for the Sacagawea dollar. It's just a dollar, spend it.
All SBA dollars should have a mint mark above the point of her collar, on the coin's left side. They were struck at all 3 mints so you could see a P, D, or S.
Susan B. Anthony only appeared on $1 coins issued 1979-81 and 1999. Please don't assume EVERY woman on a U.S. coin is her. In fact, the vast majority of U.S. coins with a woman on them carry a picture of MISS LIBERTY, as in "Statue of ..."!!!!
About $20-30 retail. However, Susan B. Anthony dollars have next to no demand to collectors so I wouldn't be surprised if a coin shop isn't interested in buying it or gives you a low offer like $5 or so.
$1 to $7500 depending upon the mint mark, the variety and the condition of the coin.
On Susan B. Anthony dollars, the mint mark is on the front side, on the left, just above Anthony's right shoulder.
S is the mint mark for San Francisco.
The coin is a SACAGAWEA dollar NOT a S.B.A. dollar. 1999 was the last year for the S.B.A. coins. 2000 is the first year for the Sacagawea dollar. It's just a dollar, spend it.
If it has one, it is on the reverse just above DO in DOLLAR.
No known errors of mint marks on the SBA Dollars, if it looks odd take it to a collector or dealer an show it to them.
If it has one, it's on the reverse above DO in the word dollar.
That's the mint mark for Philadelphia.
If it doesn't have a mint mark, that means it was made in Philadelphia.
Regardless of mint mark only proof and mint state coins have more than face value.
All SBA dollars should have a mint mark above the point of her collar, on the coin's left side. They were struck at all 3 mints so you could see a P, D, or S.
It's almost certain you have a Morgan-design dollar, and the woman pictured on it is Miss Liberty. There could not be an 1887 Anthony dollar for 2 reasons. First, Anthony dollars were made in 1979, 1980, and 1999. Second, Ms. Anthony was very much alive in 1887 and was widely reviled by many people in government (all male) who were opposed to granting rights to women, so she would never have her image on a coin from that period.The mint mark position on all Morgan dollars is the same - above the DO in DOLLAR on the back. Please see the Related Question for more information.
Susan B. Anthony only appeared on $1 coins issued 1979-81 and 1999. Please don't assume EVERY woman on a U.S. coin is her. In fact, the vast majority of U.S. coins with a woman on them carry a picture of MISS LIBERTY, as in "Statue of ..."!!!!