Did you buy it to shoot, or worry over?
Shoot it, enjoy it, and don't worry about it.
I think you should get it lettered, but I would still shoot the heck out of it. That's what guns were made for. Not collecting. A tool that never gets used is worthless.
BTW, that isn't what I thought you were describing. It has the bull barrel, not the pencil version, which would have made it worth quite a bit more.