This coin is a HitList 40 Morgan Silver Dollar VAM 228B 1878 REV of 79 Variety.
The variety shows 3 vertical polishing lines in the middle outside of the ear with diagonal polishing lines in the T in LIBERTY. There is also a broken 4th right star.
There are only 22 graded by ANACS with only 1 in MS. This coin is rare with not many specimens available.