Not all the 1915 recessed ear coins have the broken tooth; this mostly appears on the 1916 examples (all 1916 recessed ear pennies known so far have the broken tooth).
I suspect they used multiple recessed ear dies for 1915 but only one for 1916, and that one happened to be the one with the broken tooth.
I suspect they used multiple recessed ear dies for 1915 but only one for 1916, and that one happened to be the one with the broken tooth.


























