A Mint issued uncirculated coin set has a current value of $8.00.
A Mint issued 1984 Uncirculated coin set has a average value of $5.00. Issue price was $7.00
The current value of a 1980 P-D-S Mint set is $8.00.
A uncirculated coin has a retail value of $485.00-$505.00
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.
A U.S. Mint issued uncirculated P & D coin set with original Mint packaging has a current retail value of $60.00, issue price was $2.40
July 7, 2009 A 1956 uncirculated mint set can be bought for about $70-$80.
These coins are potentially still 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 20 cents. An Australian 1980 cupro-nickel 20 cent coin (Elizabeth II), uncirculated and in absolute mint condition could fetch up to $3 AUD. There were 84.357 million minted. An Australian 1980 cupro-nickel 20 cent coin (Elizabeth II)(Proof), uncirculated and in absolute mint condition could fetch up to $5 AUD. A reputable coin dealer will be able to give a more accurate valuation.
The letters are actually called mint marks rather than "stamps". They indicate which mint struck the coin. Philadelphia didn't put a P mint mark on quarters until 1980, so any coin with that mint mark is recent and quite common. Unless your coin is in gem uncirculated condition it would have no extra value.
If it's not a uncirculated or proof collectors coin in the mint package spend it.
A U.S. Mint issued uncirculated P & D coin set with original Mint packaging has a current retail value of $50.00, issue price was $2.40
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