Look at half and large cents. My favorite die crack is http://coinfacts.com/large_cents/matron_head_large_cents/1818_large_cents/1818_large_cent_n10.htm and my favorite die break is http://www.coinfacts.com/half_cents/1811_half_cent_varieties/1811_half_cent_c01.htm
Die cracks in general have to be massive to be worth anything... And those kind of massively cracked dies don't last long.
why do we still have "Happy 4th of July"? That is just boggling my mind. I think we should have a contest for when it comes to Christmas to see how long that will last
I like finding nice die cracks. This is one of my Canadian cents that has multiple die cracks: This is one of my world coins that has a die crack that extends from one side to the other: One of the members here had an amazing Indian Head struck from a shattered die. I don't remember who had it. Maybe someone kept a copy of the pic.
I assume you mean on modern coins. The coins from a press drop into a holding bin and every few minutes the pressman picks up a handful and examines them. If there are no problems he dumps the holding bin in with the others. If he does find a problem, such as a die crack, the press is stopped and the die changed. The coins in the holding bin are condemned. Since the coins are checked frequently most die cracks are caught before they have a chance to get very big. Many years ago it was more important for the dies to be used as long as possible because dies were expensive and time consuming to produce. In the late 18th and early 19th century the dies were normally used until they went to pieces.
