Looking through some coins that I ordered a few months back tonight noticed a error on 1 of the 3 1957 in the word Liberty.
Your photos are too small for me to see what you are referring to. Could you please post a clear closeup of the area in question. Thank you. EDIT. From what little I could make out, it looks like it may possibly be a die chip.
I'm going to say a Die Chip Break between the B and the I in LIBERTY. They are known to be found on many Cents from the 1950's. Especially 1957 and 1959. Nice find but really nothing major. They can be found on any year even Copper plated zinc cents. Here is one from my collection 1994 Known as BIE's http://www.lincolncentresource.com/FAQ/BIE.html
