It's a common Susan B. Anthony dollar coin with no silver in it just spend it
The only dollar coins issued in 1980 were made of cupro-nickel, not silver. They're only worth face value.
They contain absolutely no silver, and they're worth one dollar each.
It's not silver and regardless of mintmark the value is $1. Only a proof or uncirculated coins sold from the Mint will have more than face value.
Morgan dollars were minted from 1878 to 1904 and again in 1921. Susan B. Anthony dollars were minted in 1980 and they're made of copper-nickel, not silver and have no added value if found in change.
1.00
1 dollar
Not silver. All circulating half dollars struck since 1971 are made of copper-nickel and are only worth 50 cents.
Please check your item again and post a new, separate question. The last $10 silver certificates were dated 1953, and no US bills are dated 1980.
The 1989 American Silver Eagles were issued as Proof and Uncirculated. Today the proof coin has an average market value of $25.00, uncirculated is $23.00.
1980 would make it a Susan B. Anthony dollar, and it's still worth one dollar.
He is asking about a 1980 LIBERTY Silver Eagle. It is a bullion coin that predates (and was privately minted) the American Silver Eagle (1986). The confusion comes from the reverse having the inscription “One Silver Eagle” which many know to be synonymous with “one silver Dollar“. It is not legal tender and is worth its weight in silver and any premium you can squeeze out of a collector.
The price of silver changes every day so any answer posted here would be out of date almost immediately. While it's not normal WikiAnswers policy to say "use the Internet", that's the best approach in this case. You can check a site such as www.kitco.com, CNNMoney, etc. for the latest values.