Sell some of your 40%ers and have it sent off to get slabbed, maybe that would give you a better idea on value? Then you may be able to take it to a coin show and see what the offers look like.
Numismaniac said:I'd check Ebay. It can be a good source for values on stuff like this. Cool find!
A 1971D double clip that's just as nice as yours sold for $48 on ebay. A beat up and not very clipped 1999P sold for $8.
So, my opinion, the market right now is probably about $30-$45 range, and probably not worth getting slabbed. Borderline though, you could probably get an almost 100% return on the fee.
KENNEDY 1971D DOUBLE CLIPPED HALF DOLLAR ***FREE SHIPPING*** | eBay
1999 DOUBLE CLIPPED PLANCHET JFK KENNEDY HALF DOLLAR ERROR | eBay

A beat up and not very clipped 1999P sold for $8.
1999 DOUBLE CLIPPED PLANCHET JFK KENNEDY HALF DOLLAR ERROR | eBay
Dig your coin, man.
Are you suggesting that the CTK should MD his coins, to maintain authenticity?
Sag - You are reading too much into it. Frankendime just "digs" CTK's coin. In other words, he admires it.
I was not familiar with the vocab.
Home schooled or private?
30 second search on ebay KENNEDY 1971D DOUBLE CLIPPED HALF DOLLAR ***FREE SHIPPING*** | eBay