1893-S Morgan Silver Dollar - Real 1893 But The S Is Added.

Check if there's any sign of a repaired hole in the rim near the S. Some fakers drill a hole and raise a mint mark from the inside. If that's the case, you'd have to buff it off.

The solvent worked but not without a little scrapping. Unfortunately, it left the area of the mm pretty scratched up. Perhaps someone will still be interested in purchasing it. after inspecting the rest of the coin more thoroughly I did notice that it has doubling on the right stars. VAM world labels it as a VAM 4. I guess that would be worth noting to assure that it is indeed an 1893-P. It's just had a rough life lol.

Did the S come off intact?

Well, the only real tool I had available was an xacto knife. It took a bit of scrapping to dislodge the S and it seemed to have an area around the mm that was added. like a flat base. I'm assuming to match the coins surface and help the mm stick. I'm also thinking they "textured" the original surface to help form the bond.

Anyway, now I'm starting to question the date. I would hate to sell this and have that be altered as well. Should I soak the date in acetone? Does the 1893-P have any identifying die markers to help authenticate it being a true 1893-P?

Yeeeaaah I probably shouldn't have gone straight for the knife. Kinda wishing I could take that one back. Oh well. I did spend some time researching the dies of the 1893-P and am 100% sure it is a VAM 4. So I guess the best thing to
Do would be to send it into anac to get it authenticated. I feel it's going to be a tough coin to sell with the shady history and mm area damage.

holy crap-oli!

I don't think the knife did much damage, even though it was not the best tool for the job. Similar to what the OP said, I think the underlying surface was previously altered and roughed up to make the mintmark adhere to the surface better.