Nice find! That is called a Die Chip. It's very commonly found in Cents minted in the 1950's especially 1957 and 1959. I have about 8 in my collection. The small break between the B and the E would of evolved into what is known as a BIE variety. Another kind of Die Break.
Congrats.. I remember my first Mint Error find almost 33 years ago! I still have it. Here is some BIE information http://cuds-on-coins.com/lincoln-cent-bies/