Hi, This coin look proof on obverse side but revers look gray and very matt. There is no cooper on the rim... Is it a proof coin? Thank you! CDNum.
There is an off chance that it could have been struck on a 40% silver planchet. Extremely rare though so most likely plated. Check the weight and that will tell the story.
I picked up a collection not long ago with a set of Kennedy's in it and they were all like this. They were housed in a whitman folder and the cardboard did a number on the reverses of the coins.