What this coin looks like (obverse, reverse, mint mark location, special features, etc.):
One major variety is the 1879 CC Morgan Silver Dollar featuring a CC Over CC repunched mintmark (RPM). This is also known as the "Capped Die" variety due to this coin being struck by a rusty die which resulted in a crusty mess around the "CC" mintmark. Although it may be hard to tell - but this variety is actually a doubled mint mark variety where the "CC" mint mark was struck over another "CC" mint mark. The difference between the 1879 clear CC vs Capped Die CC Morgan dollar varieties is depicted below in the example comparison image:
Coin valuation chart: Typical coin prices, values and worth per grade or condition - in USD