Another way to know it isn't a cracked collar is: on a cracked die the result is a raised line on the struck coin. A collar crack will show a raised line on the edge of the coin. The edge of this coin is flat and smooth. Likewise a die break causes a raised area on the face of the coin, and a collar break results in a raised lump on the edge of the coin. Now if the bottom edge of the collar breaks the lump on the coin edge will show evidence of having been sheared off during the ejection of the coin and may showa raise lump at the junction of the edge and rim.