If there is one it's on the back above the letters DO in the word dollar.
There were no 1888-CC Morgam silver dollars minted.
The mint mark on any Morgan dollar is located on the reverse (tails) side, near the bottom, just above the letters "do" in the word "dollar."
It is not difficult to find one.
1888 makes it a Morgan silver dollar, which has a weight of 26.73 grams and a diameter of 38.1 mm. A heavily worn specimen might weigh slightly less.
Lowest value would be $15.00 just for the silver.
It's 90% silver with 10% copper. The coin's total weight is 26.73 grams.
The face on the 1888 silver dollar is that of Lady Liberty.
about $25 depending on condition and mint mark
If the coin has one, it's on the reverse above the letters DO in DOLLAR.
It's a Morgan dollar and the 1888 is a common date. Retail values for circulated examples are $15.00 to $27.00 uncirculated coins start at $30.00
If you mean a 1888 Morgan silver dollar? It's a very common coin. Circulated coins are worth $31.00-$44.00.