Seems too sharp edge to be degradation. And I know I'm never gonna hear "that's a double die!" So, what kind is this?
Looks like what you suspected: deteriorated die doubling, to me; but, I am not an expert who can offer a definitive opinion. Welcome to CoinTalk @Tin_Man_0 (By the way, we usually like to see the entire obverse and reverse of coins. It can happen that our experts may observe something interesting on a part of the coin that the OP did not notice.)