No, all double headed coins (or double tailed coins) that are of a modern coin are privately made pieces. In modern mints ,it is impossible for a worker to insert 2 obverse (heads) dies, or 2 reverse (Tails) dies in the machine to strike a double heads/tailed coin the dies simply will not fit into the machine.
A 1971 Kennedy half dollar is worth anywhere from $45 to $280 dollars. The Kennedy half dollar began circulation in 1964.
The 1964 Kennedy half has .36169oz of pure silver in it.
JFK wasn't on the half dollar until 1964. If you have a double-headed coin with two different dates, it means someone cut up two coins and fastened them back together to make a trick coin.
1964, the year after Kennedy died.
The 1964 Kennedy half has .36169oz of pure silver in it.
In some cases, a double die adds to the value of a coin but in other cases it does not. Whether or not the value increases by the presence of a double die is determined simply by the market demand for them. For this Kennedy half I find the value in uncirculated condition to be about $18.
1964, the year after Kennedy was assassinated.
No 1963 Kennedy half dollars exist. 1963 is the last year of the Franklin half dollar. 1964 is the first year for Kennedy.
1964 proof Kennedy half dollars are not hard to find. Average retail value is $10.25 for most examples.
1964 Kennedy halves are the most common 90% silver half dollars. Most are valued just for the silver, about $12.00.
If you search this site a bit you'll find hundreds of questions about so-called "double-headed" coins. They're all fakes, novelty or "trick" items made by cutting 2 coins in half and swapping the sides. They generally have no interest to coin collectors. The good news is that if your "coin" was made from 2 genuine 1964 JFK half dollars it has maybe 6 or 7 bucks worth of silver in it. If either date is later it's worth less than that amount because 1965-69 halves are only 40% silver. and 1971-today are made of cupro-nickel.
All silver half dollars, including the 1964 Kennedy, weigh 12.5 grams.