$30-$50 depending on condition.
http://www.pcgs.com/prices/PriceGuideDetail.aspx?MS=1&PR=1&c=121&title=Liberty+Seated+Half+Dollar
It is a counterfeit.
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The 1851 Liberty Seated Dollar is valued from $10,000.00 to $45,000.00
Arrows at date S.L. halves were struck at the New Orleans Mint for 9 years, a DATE would help. Post new question.
A real 1851 Seated Liberty Dollar is valued at $10,000.00 to $50,000.00
Well its about 100-200$ if it is in good condition.
A 1872 Liberty Seated dollar without the "S" mintmark in circulated condition is valued from $300.00-$900.00 depending on the grade.
There are only 4 known genuine 1861 C.S.A. Seated Liberty half dollars. Many replicas and counterfeits exist.
Retail values are $216.00-$810 for circulated examples of a Liberty Seated Dollar of this date.
If you mean a Mint State 1865 Seated Liberty dollar coin? Retail values are $3,000.00+. If not, post new question.
There's no such coin. The last Liberty Seated dollars were struck in 1873. The Morgan series started in 1878.
$300 to $150,000 depending upon the date and the condition of the coin.