What is the worth of 1877 silver dollars?

The only dollar coins minted in 1877 were Trade Dollars, identifiable because they have those Words on the back.

If your coin has that Wording, its value depends on the condition and mint mark:

S mint mark or plain (Phila) prices range from $65 to $200.

CC mint mark coins range from $500 to $2500.

If you have any other design is it either a fantasy piece or a counterfeit; both are known to exist.