About this set: This complete set includes one of everything, although some interesting major varieties are excluded. It also rightly includes the 1964 Special Strike Kennedy halves, which are not true Special Mint Set coins but are Specimen Strike coins and among the rarest coins made in the 20th century. The bold strike is characteristic of proof coins, but they were struck from business strike dies that show heavy, crisscrossing die polishing lines. Only a single die pair was used for the dozen or so halves known (we have bought and sold most of the survivors of all denominations; the halves are the rarest by far). John Dannreuther has written of these, "Although the exact source of the Special Mint Set strikings of 1964 coinage is uncertain (most believe they came from the estate of dealer Lester Merkin), they have been trading in the numismatic marketplace since their surfacing in auctions beginning in 1993. Their inclusion as separate varieties is analogous to the separate listing of Satin finish examples in Mint Sets, which were first issued in 2005. Both are striking variations that represent a variation from the normal strikes (hence, PCGS listing them as separate varieties)." [Actually, we have found Stack's auctions of these as early as 1991.) A "complete" set will never be complete without an example of the 1964 Special Strike Kennedy half, the true key to the set.