Going through some coins that were gifted to me recently and came across this nice 1971 D Kennedy half dollar. I'm somewhat new to collecting and I still have a lot to learn with recognizing doubled die coins. I could use some help with determining weather the doubling looks to be flat and shelf like vs a true doubled die. Most are quite distinguishable for me but this one has me stumped. On the obverse of the coin, I've spotted some doubling on Kennedy's neck just under the chin, the L in LIBERTY, and the word TRUST seems to be raised quite a bit. On the reverse of the coin, the E in UNITED and the M in America seem to have some obvious doubling but I can't exactly tell if its machine doubling, deterioration, or an actual doubled die.
It's strike doubling, not die doubling. Here's another clue to it besides the oft-repeated "flat and shelf-like." Look at the right stem of the "v" in between the legs of this M. Do you see how abnormally thin it is? That's due to the doubled images on either side of the stem borrowing from it to form them. The planchet shook a bit when it was struck, that's what caused that. That's just most apparent in this M, that's why I'm illustrating with it...
