what is the value of a 1888 O silver dollar
There were no 1888-CC Morgam silver dollars minted.
Assuming the coin is circulated and has no mintmarks, retail value is $17.00-$26.00 depending on how much wear the coin shows. The 1888 Morgan is very common.
Lowest value would be $15.00 just for the silver.
about $25 depending on condition and mint mark
There has never been a circulating Walking Liberty silver dollar, only a 50¢ piece issued from 1916 to 1947. The design is currently used for bullion coins but these don't circulate. All 1888 silver dollars have a Liberty Head design and are called Morgan dollars after the artist who created that image.
A certified example has a average market value of $240.00.
If you mean a 1888 Morgan silver dollar? It's a very common coin. Circulated coins are worth $31.00-$44.00.
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
July 26, 2009 An 1888-S Morgan silver dollar in a good circulated condition [much wear] has a value of about $145. If it is good enough to be almost uncirculated [almost no wear] it has a value of about $300.
Look at the date again. No Carson-City coins were struck in 1888.
Assuming the coin is circulated and has no mintmarks, current retail value is $33.00-$44.00 depending on how much wear the coin shows. The 1888 Morgan dollar is very common.