It looks like strong toning due to the enviroment or enviroments that it has been it over the past 64 years! Frank
I have seen many that exhibited this same colored patina (for lack of a better term). So my opinion would be that it is toned that way not painted or otherwise intentionally given this hue.
This looks like one of the coins which toned as a result of being in D-Day and the Battle of the Bulge. Later, as GI's took these coins home, they gained a unique toning, some cal it the Madonna Crying Tone or the Joan of Arc Tone because of the Miraculous nature of the toning over time. Ruben PS also on these unique coins, if you look closely, sometimes with the help of a black light, you can see the ghost of Thomas Jefferson in different windows of the house. I kid you not! Be warned.
A few of my silver nickels have the same toning on it. If i mix it in with regular nickels i can easily pick them out Cool circ find by the way. I got myself an 191X wheat cent today as well in change.
Mike,we often find these War Nicks in old collections,as well as in bulk lots over here in New Zealand.I can guess that these were used over here by the Americans who were stationed out here during World War II in their canteens & clubs,along with the Mercury Dimes & Walker $1/2 coins. Aidan.