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.
A normal 1991 S proof set is worth $9. A 1991 S proof prestige set is worth $51.
If your proof set has 9 coins it is worth $15. If it has 5 state quarters it is worth $9. If it is a regular silver proof set it is worth $144.
A Proof set is $8.00 & a Mint set is $5.00
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.
The US mint did not produce proof sets in 65,66,67 it'sreferred to as a Special Mint Set and the coins are not proof,but have proof like brilliance.The values are $9.00 for the 1966 set, issue price was $4.00
A 1999 US Mint 50 State Quarters Proof Set is worth about five US dollars. However, a 1999-2008 US Mint 50 State Quarters Proof Set is worth about 100 US dollars.
If you found it in change, 1 cent. If it's in a mint set or proof set: With no mint mark and in uncirculated condition it's worth $0.25. With D mint mark and in uncirculated condition is worth $0.10. With S mint mark, large date in uncirculated condition is worth $0.15, proof is worth $1.00. With S mint mark, small date in uncirculated condition is worth $30.00, proof is worth $60.00.
The US Mint did not produce any proof sets in 1943.
Proof sets were not made in 1965, but a 1965 special mint set is worth $12.00 USD.
It wouldn't be a proof set if it was struck at the Denver mint (all proof sets 1968-present have been struck at the San Fransico Mint) and so it would instead be a partial mint set. I'd say it would be worth about $3-4 if it was sealed.
August 17, 2009 The 1988 US Mint Proof Set sold for $11 in 1988. Today it has a value of $10.
Average retail price is $14.00