What is the value of an 1889 twenty dollar liberty gold coin?

The current price of gold means that most 1889 double eagles are worth more for their metal than as collector's coins. Assuming average wear, it would sell for about $1100 regardless of mint mark.

If you have a coin in almost-new condition AND it has a "CC" mint mark on the back, it does have a collector's value of up to $1900.