I just picked up an auction lot of 30-30 which I bid for the other content but there were 2 empty cases with head stamps that I have never see.
#1 a brand new 30-30 case with the head stamp F C 30 AMERICAN. I have never heard or seen the designation 30 AMERICAN on a 30-30 case.
#2 a steel copper plated berdan primed empty case. Probably it was a loaded round with bullet and powder pulled. With head stamp N I C .30 - 30.