The 1987S proof set is a collection of 5 uncirculated coins minted in San Francisco by the U.S. Mint. This item includes five proof sets  from the United States Mint, each struck in a proof finish. The coins are guaranteed to be in pristine condition and come directly from the mint, making them a desirable addition to any coin collection. 
This rare package contains 5 Proof sets in the same unopened package as received from the postal service, 39 years ago! 
There could be unusual oddities in the unopened package!