Gem Bright White Perfect US Proof Set--1964 with JFK Silver Half Dollar-Lot #289
The headline pretty much tells the entire story. This is the last of the early US silver proof sets, struck with the then new Kennedy half and silver quarter and dime, as well. It was produce as the price of silver peaked (now pretty much a valley in price compared to the present) and silver was removed form all US coinage.
The set here is a gem, not a speck of discoloration, even natural toning. Look at JFK's hair to determine the perfect strike of 1964.