Grade Suggest For 1878-S Morgan

MS64. Based on those images it looks dipped.

The lighting is not the best. My guess is MS-62.

Your Morgan dollar looks to be MS-63 to me.
I dont think the coin has been dipped or cleaned.

I disagree with the consensus. Based on those images at least that coin had been dipped at some point. Just compare the way the light reflects on the surface to that in a white GSA Morgan and you'll see that. The bounce has been compromised by the dip.

That said, you never want to get hung up on labels. That's a loser. At the same time, though, that doesn't necessitate you evaluate coins like you're half-blind. That is to say, this coin is perfectly acceptable for the market if you just consider this one thing--many if not most white Morgans have been dipped and they slab and trade in the major auction venues every day. A lot of that occurred, paradoxically, to dip out the very attribute many of us, today, collect--namely, tarnish. And that's why you'll be pressed to find a tarnished GSA Morgan in an "Uncirculated Silver Dollar" holder. Today, the "coin doctors" dip to impart tarnish; back then, they dipped to remove it.

Again, it looks to me, based on those images, as though the coin had been dipped at some point, but that's nothing to freak out about. Bottom-line, it's a perfectly market acceptable coin.