Looks like you found a legit BIE die chip. Good find! Here's the only one I have photographed; I'm not sure if I have more.
Nice. They are very common on Cents minted in the 1950's and 1960's.. They can occur on any year. Once I found 3 different BIE's on 1994 Copper Plated Cents - Some information - http://www.lincolncentresource.com/FAQ/BIE.html
I got 9 in a row from a 1955 S roll and yes petty exciting as they are now considered a variety as opposed to an error
quote from CONECA: BIE die break This is a sub-category of the die break affecting the letters of LIBERTY on the Lincoln cent. Technically, only a die break between BE of LIBERTY qualifies as a BIE. Generically speaking, however, a die break between any of the letters of LIBERTY qualifies. This variety was termed the “BIE” because that is where the vast majority of die breaks occur. This area of collecting was again the rage in the 1960s, but waned when the obverse die was modified and there were fewer specimens to collect. However, recent years have seen a new crop of this variety showing up and an increased interest.