http://www.error-ref.com/ This is a good reference for mint made errors. http://www.error-ref.com/?s=Cud What you have are interior die breaks.
Sorry, but it's as @Pickin and Grinin has said. These are not cuds. They are interior die breaks, that eventually, if not caught in time, will continue to form into a die crack that will progress outwards and often times go all the way to the rim leaving more die chips as it gets worse. Cuds happen when a portion of the outer edge of the die breaks away and involves the rim of the coin. I'm sure @paddyman98 has an example in his collection he might provide as an example?
I thought I'd post one that fits this thread well. There are three errors involved with this 55S, all of them are die breaks. This is RIDB-1c-1955S-01 http://cuds-on-coins.com/
Die breaks have lines that radiate in a direction/directions. When a die, has deterioration, there are many things that happen. Cuds are usually larger on the edge, because there is no collar on it's edge, correct and the die's metal brakes away? Why, because the metal fatigue is so much greater when there is less resistance on the outer edges. In the center it pockets out, by the extreme stress in the center, so where will the fatigued metal go? It jumps out of the weak area, and you have a hole. It will get larger with time and an increase in pressure. = die fatigue.
Uh Ohes. I spent last 2 nights glancing at 3,250 UNC / near UNC 2017 P's, and didn't even glance at Roosie's hair ?!?!? ed.: the couple of you guys who've bought rolls of my 2017 P's; if any turn into $12.00 / apiece dimes, you're welcome...
Thanks for all the info regarding Cuds, and interior die breaks...it makes more sense now. But what about the the Wisconsin Quarter with the high leaf and low leaf? Would those be considered interior die breaks as well?
You guys are full of information...boy do i have a lot more to learn. I am still intrigued by these imperfections (interior die breaks) so i am going to start a separate collection of these and see how many i get. The fun part will be naming them too like "the cold sore dime" lol
Speaking of coin rolls, I spoke with a company called "Coinstar" (change for cash machines, in case some dont know) and i am purchasing some coin rolls from them. I can only imagine the change I will find there.
Those are officially doubled dies. These errors were incorporated into the dies while they were made. Someone who was supposed to see/inspect this before putting it into production missed this. Poor quality control at that point and it was not caught until after many coins were produced and further quality control of the coins them selves were found.