What can you tell me about this emblem?

I found this emblem in a box of misc. emblems I had in my garage. Its about 2.5 x 1.5 inches. It is in pretty good condition, with minor pitting. I could only find one thing saying that a similar emblem was from a 63-66 Dart Fury Belvedere and Barracuda.

Is this reliable?

Are these worth anything?

Is there a way I could clean it up more (more than washing it with dish soap)?

RTom