About ~20 cents over face value as a set. They contain no silver and uncirculated sets (Even more so than proof sets!) have very little collector demand at the moment. So you should add up the face value of all the coins in the set then add 20 cents to that and that is about the value of the set (assuming it is in mint packaging).
If you have obtained an annual uncirculated 1975 yearly set, its present value is: $15.00.
The 1970 Uncirculated US Mint Set is valued at $18.
The 1977 US Mint Set (12 coins) has a retail value of $10.00
1975 Proof sets are valued at $11.00.
Current retail value of the 1964 10 coin mint set is $31.00 issue price was $2.40
The current value of a 1980 P-D-S Mint set is $8.00.
If you have obtained an annual uncirculated 1975 yearly set, its present value is: $15.00.
The 1970 Uncirculated US Mint Set is valued at $18.
These coins are no longer in circulation since Irelands changeover to the Euro in 2002. Unless they are part of a Proof or Uncirculated mint set or are individual Proof or Uncirculated coins and in absolute mint condition, they have little or no value.
If the set is a mint issued Uncirculated Coin set that includes the 1996-W dime. Current retail value is $21.00.
The US Mint did not issue any silver coins of any kind in 1980. If you have silver coins dated 1980, they are not US coins.
If this set is the 1980 Dollar Souvenir Set in a big Green envelope. This is the 3 coin SBA set with the P, D and S Mint marks. They are very common with an average retail value of $7.00.
These coins are still potentially in circulation so, unless they are part of a Proof or uncirculated mint set or are individual Proof or uncirculated coins and in absolute mint condition, they are worth Two Pence.
The set needs to be seen for an accurate value. A complete set of Lincoln cents from 1938 to 1959 has 62 coins in it.
The 1977 US Mint Set (12 coins) has a retail value of $10.00
1975 Proof sets are valued at $11.00.
Any value would depend on whether they are Mint Uncirculated, Proof, Year Sets, or circulation coins and what condition they might be in.