1984 Die Crack?

I was just looking at a proof set of 1984 coins and noticed Lincoln has what looks like a die-crack running from his forehead to his jacket collar. My first error coin find since learning about them within a few months. It looks as if the die-crack is a "welp" across his face. Anyone heard of this? I dont have a scanner to post a pic.

 

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Are Proof sets examined at all before they sell them?

 

Here is the cent in question. The die crack starts on forehead and goes all the way down to his collar.

 

So, since it is a Proof die-crack would that make it worth a little more to an error collector? I dont plan on selling it just curious to know what this type of error may be worth.

 

2 other possiblities on this one, a die gouge, or more likely, bubbling in the plating.