A little bit of Seated Liberty facts:
Seated Liberty dollars were minted from 1840-1873.
All SLDs were minted in Philadelphia except for New Orleans (O mint mark) in 1846 (59,000 minted), 1850 (40,000), 1859 (360,000) & 1860 (218,930 business strikes, 1,330 proofs), Carson City (CC) in 1870 (11,758, 1,000 proofs), 1871 (only 1,376), 1872 (9,000) & 1873 (2,300)and San Francisco (S) in 1870 (maybe...unknown quantity) and 1873 (also maybe, if any, in VERY limited quantity, none are known in any collection).
Charlotte N.C., WAS a US mint and did use a C as a mint mark but it never made
Seated Liberty dollars.
I'm sorry but I agree with the other posters, your coin appears to be fake.

(It also appears like it may have some rust on it. And, as we all know, silver doesn't rust...)