Nice find! 
These are called Interior Die Breaks or Die Chips depending on the size. A small piece of die will chip off which will cause the coins struck with it to have a raised image to match the missing metal on the die.
Here is a website that lists known example of it: http://cuds-on-coins.com/Lincoln-ce...s-1950-1958/
These are called Interior Die Breaks or Die Chips depending on the size. A small piece of die will chip off which will cause the coins struck with it to have a raised image to match the missing metal on the die.
Here is a website that lists known example of it: http://cuds-on-coins.com/Lincoln-ce...s-1950-1958/




















