With me it's the 1943
Lincoln Cent. When they first came out my Dad gave me some and then he continued to find them for me in change. I accumulated 26 rolls of them before I even started collecting coins as a hobby. I still have all 26 rolls. Odd also so many people with the same name as me lately. Here on this forum, a neighbor, and the real funny one is the guy that built my computer had the name Carl, his assistant is Carl, my son is Carl, my Dad is Carl.