There were no silver dollars struck at Carson City in 1887. Any 1887 dollar with a CC mint mark is a counterfeit.
No Morgan dollars were struck at the Carson-City Mint in 1886, 1887 or 1888. Any coins with these dates and "CC" mintmarks are fake.
Sorry no Carson City mint marks in 1887 on a Morgan dollar. Look at the coin again.
Assuming you are asking about a 1887 Morgan silver dollar. Circulated coins are valued at $30.00-$40.00.
1887 is a common date Morgan retail values are $17.00-$26.00 for circulated coins. Uncirculated start at $30.00
1887 is not considered a rare date for Morgan dollars. In MS-62 grade, it is currently worth about $30.00
1887 is a common date for Morgan dollars. Retail values for average circulated coins are $37.00-$40.00
The mint mark position on all Morgan-design dollars is above the DO in DOLLAR. No mint mark = Philadelphia O = New Orleans CC = Carson City S = San Francisco D = Denver (1921 only)
As of 10/2008 an 1896 Morgan/Liberty Head Silver Dollar minted in Philadelphia in fine condition is worth $18.00, uncirculated is worth $34.00, proof is worth $1,300.00 It is a fairly common date - it would be worth $17 - $22 in circulated condition, and perhaps $35 - $70 in uncirculated condition (depending on just how uncirculated it was - you'd need a dealer or other specialist to judge the condition for you).
The coin is a very common MORGAN dollar, circulated examples sell for $17.00-$26.00 depending on condition.
Mintmark's are used on coins, they do not have "proof marking's". The 1887 Morgan dollar without a mintmark was struck at the Philadelphia Mint.
The first US dollar coin was struck in 1794.
The coin is worth about $14.00 as of today just for the silver, if it's in a collectible circulated condition, value is $17.00-$26.00. For Morgan dollars 1887 is a very common year.