There are mint sets and there are proof sets, and they're not the same. Mint sets are ordinary-strike coins, selected for quality, and packaged at the mint so they're uncirculated and untarnished. Proof coins are specially struck on prepared blanks that give them a mirrorlike surface. They're minted separately from ordinary strikes and are intended only for proof sets.
Please post a new question identifying which type of set you have so it can be valued. Thanks!
The 10 coin set with box list at $33.00 retail
The Mint sells them for $52.95+$4.95 for S&H.
The standard 18-coin set has a average current retail value is $26.00, issue price was $29.95
The only U.S. Mint issued proof gold set dated 1991 is the gold bullion 4 coin set. It has the $50, $25, $10 and $5 gold coins as a set. Current average market value is $4,000.00.
Issue price was $12.50, average retail value $25.00
With original Mint packaging retail is $30.00 for a Silver Proof Set
Current retail value is $11.00 issue price was $12.50
The U.S. Mint does not make "proof mint sets" of any year. The two types of sets have very different coins in them. A 1980 PROOF set has a current value of $5.00 and was issued for $10.00. A MINT set has a value of $8.00 and was issued for $9.00.
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.
6 coin mint set 1994
July 9, 2009 The Uncirculated US Mint set is valued at about $15. The 2005 US Mint Proof set is valued at about $25. The 2005 US Mint Proof set is valued at about $42.
July 9, 2009 The Uncirculated US Mint set is valued at about $15. The 2005 US Mint Proof set is valued at about $25. The 2005 US Mint Proof set is valued at about $42.
The 5 coin proof set has a value of $6, the 10 coin set has a value of $15 and the 10 coin silver set has a value of $48.
The 2006s 10 coin proof set has a retail value of $31.00 issue price was $16.95
Current value of the 2003 10 piece Proof set is $10.00. Issue price was $19.95.
There is no record of the Royal Mint having produced a "gold" Proof set in 1974, only the usual Proof set. Royal Mint gold Proof sets issued from 1980 contain only the "Sovereign" coinage.
A normal 1991 S proof set is worth $9. A 1991 S proof prestige set is worth $51.