I suggest you keep it. There's not that many out there. Good luck whatever you decide to do. Here are some photos of mine and a portion of the factory letter . . .
Here are my boys (4013 & 4014) together . . .
. . . and the 4014 after a range session. I hate to admit that the two rounds not in the same one hole are . . . well, my fault.
Here's the letter indicating the number produced.