1972-D Kennedy Half
Obverse Indented by 1C Planchet
NGC MS 64

This Kennedy Half was fully indented by a Cent planchet. Somehow a Cent planchet entered the collar along with a Half Dollar planchet.

There possibly exists a Kennedy Half struck on a Cent planchet with a uniface reverse, which would make this an amazing and unique mated pair.

Indents are featured in chapter 14 of my
NLG Award winning book, World's Greatest Mint Errors: