What are silver trade dollars worth?

If you mean turn them in for silver? you can't, June 24 1968 was the last date to redeem silver certificates.

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...

Depending on condition, between about $21 in "Very Good" condition (which is a numismatic term of art meaning "not very good at all") to $62.50 in "Extremely Fine" (circulated, but with very little...

For 1971 & 1972 only proof versions of this coin were struck in 40% silver and have values of about $6.00.

The U.S. didn't mint any silver dollars from 1905 to 1920 inclusive. Please check again and post a new question.