That's just damage on the "2" of the date. It's Post Strike Damage (it happened after it left the U.S. Mint). The "Doubled Rim" is called a Rim Fin. http://www.error-ref.com/finning/
Double rims have a several ways of developing on coins. Some are common and some not so much. The one I find most interesting are the ones produced by a wide collar issue. http://www.error-ref.com/wide-collar/
I also like a good Rim Fin as well. Ones with a unique unquestionable upward spread due to the coin metal squeezing into the thin gap between the die and collar. Thanks, Doug.
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