What this coin looks like (obverse, reverse, mint mark location, special features, etc.):
One major variety of the 1878 Morgan Silver Dollar features 8 Tail Feathers on the eagle at the reverse of the coin. Other later versions were changed to 7 tail feathers. The difference between the 7 Tail Feathers vs 8 Tail Feathers is depicted below in the example comparison image:
Coin valuation chart: Typical coin prices, values and worth per grade or condition - in USD