Standard references United States large cents 1840 to 1857 my Grellman. Unfortunately the book is not easy to get a hold of and it takes a fair amount of practice using it to be any good at. At least the coin you have is in high enough condition to make attribution possible. Attributing late dates from pictures oh is rather difficult and in many cases impossible. Attribution often depends on tiny little points faint die lines which just do not reproduce well in photographs even quality close-ups of the proper area.