Found Some Neat 66 Doubled Die Kennedy's

Not sure how to answer your questions. Like already mentioned, James Wiles web site "VarietyVista.com" is a good place to start when talking about all die varieties (all denominations). Dr. Wiles maintains the CONECA master listings for DDOs, DDRs and RPMs on this site.

On value and highest premium? Like anything else, it comes down to supply verses demand. As a whole, "die varieties" collectors are just a small part of the coin collecting community with " Kennedy half dollar Die Variety" collectors being an even smaller sub group of them. The highest premiums seem to be for the varieties listed in the CherryPickers' Guide. Earlier this year, I watched four 1967 Kennedy half dollar DDR-001 (FS-801) sell on ebay (graded PCGS MS65) for between $475 - $800. What price would be realized if another 1967 DDR-001 (FS-801) came available in MS65 condition is anyone's guess but the demand would be less because five collectors already have one in the top current grade. If you found a 1967 Kennedy DDR-001 (FS-801) that graded out MS66 at PCGS then with the limited demand you probably have a coin valued between $1000 - $1500. On the other side, if the condition of the coin is only an AU50 then it is probably not worth the grading and attribution fees but you still have $10 - $25 coin to the right person.

Is a doubled die worth more then melt value? As a general rule, yes, the better condition coins bring more. Again, some varieties are more desirable then others so the prices will reflect this.

I would recommend picking up a copy of the CherryPickers' Guide 5th Edition, Volume II, which covers the Kennedy series and bookmarking Varietyvista.com on your computer. Remember, that the "hunt" is the fun part of variety collecting so enjoy yourself while searching your stash of 40% silver, you never know what you will find on the next coin.

Some of these are incedibly rare n that's why they bring big premiums . However one could pick up a dozen 66 mint sets and Id bet at least half , maybe more have doubling. So many and very similar lots of minors it probaby takes longer to attuned them , then its worth posting them up , there are so many It's ridiculous , and when you see this first hand you figure out , they can be so common they really aren't worth a hoot to the common collector , eand in this case maybe not even to a seriou s one. Another note that some truely are too rare. I know people that have looked through thosands of sets , literally n found 1 of the rate FS's at times.AND many people don't know there a lot of mass sellers on the bay that LOOK at their sets b4 unloading them. Just ebay 1970 small date proof set or something and you'll see people selling by the hundreds , would you buy anything from this seller ?! Most coin dealers now assuage are dishonest , so be careful with your searches or sources, some coins are worth much because , you just can't find them