Re the discussion - yes, it's called toning and is very common on proof sets. Its value would be in the $11-12 range.
The value of a 1978 proof set with gold-toned Kennedy half dollar and nickel can vary depending on the condition of the coins and the current market demand. These sets may have a higher value to collectors who are interested in unique or error coins. It's recommended to have the set evaluated by a professional coin dealer or numismatist to get an accurate assessment of its worth.
They are intended for circulation, struck in copper-nickel and only worth 50 cents unless in proof condition.
No Kennedy half dollar dated 1973 was struck in silver, all are copper-nickel coins. Unless it's a proof coin, the value is 50 cents.
A 1969-S proof half dollar - aka - Kennedy Half Dollar is worth: $7.00.
A 1957 nickel is worth face value only, unless it's uncirculated or a proof coin.
1964 proof Kennedy half dollars are not hard to find. Average retail value is $10.25 for most examples.
It has a value from $5 in the lowest proof grade [Proof 60] to $375 in the highest proof grade [Proof 70]
No, the only Kennedy Half dollars after 1971 that are worth more than 50 cents are those found in proof or silver proof sets.
A Kennedy Half Dollar that was minted in 2007 and carries a mint mark of "S," was produced in clad and silver. The clad in a proof state is worth: $4; in silver, the value is: $7.00.
It is only worth face value. It is intended for circulation and made out of copper-nickel.
The US half dollar minted since 1964 has John Kennedy's portrait. Those minted in 1964 are 90% pure silver. Those from 1965 to 1970 are 40% silver. All minted after 1970 (except those included in silver proof sets) are copper-nickel and contain no silver. US Mint "Prestige" proof sets include 90% silver Kennedy Halves, although all others versions of the coin including standard proofs are made of copper-nickel.
$0.25 or $0.75, if it is uncirculated or a proof coin. Otherwise, 5 cents.
In circulated condition, cupro-nickel dollars are worth face value to $1.50 depending on condition and variety. A dealer will pay face value only. Proof cupro-nickel dollars are worth $5 to $7 retail Uncirculated 40% silver 1976 dollars are worth $3 to $5 Proof 40% silver 1976 dollars are worth $11 to $13