The 1987-D Kennedy Half Dollars were only issued in Mint Sets for the year. No 1987-D Kennedy Half Dollars were released into circulation by the U.S Mint. However, the Mint had previously announced that the coins would not go into circulation. This allowed collectors to buy them directly from the Mint. As a result, mintages for the 1987 Mint Sets were significantly higher than the previous year.
Most 1987-D Kennedy Half Dollars remain in high grade since they should have never entered circulation. Only examples in MS67 grade or higher appear to be scarce with less than several hundred examples surviving. Coins in MS68 condition are considered a condition census, since there are less than a dozen graded by PCGS with none being graded higher.