Help With 1991 Penny Error

Hi guys. I was looking trough a bunch of pennies and this one caught my eye. The coin seems to be missing the "1" after the "9" in "1991". The only thing in place is a ghost image of "1". After I ran my finger over the coin the "1" is flat. Does anybody know what type of error this is or even it is an error? All help is appreciated and thank you in advance for all the help.

 

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grease filled die or possibly just worn out. Not worth more than a penny.

 

Here's another one for ya

 

Way cool cents!!! keep looking~~~~~~~~

 

Thanks for the responses. So overall the penny still seems to be only worth a penny . Thanks Again, Jimmbob82

 

Grease Filled Die, very little if any premium. A 1943 missing 3 in on the home page of the CONECA website. Look at it..

http://conecaonline.org

 

I have a 1936 wheat cent that is missing the "I" in the word "LIBERTY". Does anyone know of anything like this and what would it be worth?