The earlier coins are made of silver, as noted, which makes them rarer. An uncirculated one could be $2, but that's probably not worth running to eBay for. Kennedy bicentennial half-dollar coins ...

These 11 Rare Coins Sold for Over $1 Million Attention to detail is important in the numismatics world, and this case is no ...

Of these, just one has cracked the $150,000 sale barrier ... Prior to 1968, the only proof Kennedy half dollar coins were minted in Philadelphia. Collectors suggest that the 1968 proof coins ...