Is this a CUD on the 1918 penny? There also seems to be cracks at the back of Lincoln’s head and at his neck (2). And what is causing the first 9 in the 1919 penny? Looks like it has a curly cue at the top of the numeral.
Not a cud on the 1918. http://cuds-on-coins.com/cuds/ IMO it looks like the 9 took a hit. Copper is a soft metal and it appears the hit pushed the copper up. It's also possible that I'm wrong and there was a small die chip near the 9. Wait for the error experts to give their opinions.
IMO, that could be a die crack on the left of the 1918, but not a cud. Is that mark into the metal or raised above the metal? It's hard to tell from the photo. On the 1919, that is not a cud or die chip. It is simply damage from a hit. If you look closely, you can see "travel" marks where, whatever hit it, went from right to left. Mozz's first explanation above is the correct one. BTW, I am not an expert. I've simply paid attention and learned from the many members of Coin Talk !! who are experts.
