Hello all and welcome to my 5000th post! In my new thread I want to show an error that is not found on neither the Obverse or the Reverse of a coin. It's found on the Collar. The name that it has been given is the Small Collar Die Break. It has also become known as the Rotating Collar CUD which I will explain. A few years ago I was intrigued by this error and wanted to find out more about it after I saw and purchased a NGC slabbed sample. The year was 2002 and the Philadelphia Mint were cranking out their Kennedy Halves. And as it sometimes happens.. trouble. The collar that holds the Blank Planchet in place cracked. Just as Obverse Hammer Die and Reverse Anvil Die Cracks, Die Cracks appear when the metal is forced into the tiny little space. This time it's on the collar. What is interesting and the reason is not known, is that the Collar Die Break is found in different positions around the Collar. The theory is that the Collar is not held in place and turns around as the Planchets are struck. There is a section on the Error-ref website dedicated to the Rotating Collar Cud which I will share with you all - http://www.error-ref.com/rotating-collar-cud/ Here is an example of a big CUD on one of my 12 raw coins in my collection.
I have in my collection 31 NGC slabbed Small Collar Die Breaks See if you can locate the Collar Cud on this piece
From the collars I've seen i can't see how they could rotate. Does this rotating collar cud change positions relative to both obv and reverse at the same timae and by the same amount? If it is just relative to the rev die, or compared to both dies but not equally, then the die(s) is probably rotating not the collar break.
Good question. It's the collar from what I have read Here is another article by Mike Diamond on the subject. I want to share this webpage with you - http://www.coinworld.com/news/us-co...alf-dollar-collectors-clearinghouse.all.html# @Conder101 let me know what you think.
The article still doesn't mention if the collar break position varies with both die faces or just one. I can see how if you have a collar with an insert that insert could break loose and rotate. And the fact that it would rotate in one direction only is not surprising. You have a piece of equipment going through a set of motions that causes a piece to rotate, as long as it keeps going through those same motions the piece will tend to keep rotating in that same direction.
@Conder101 - I just found this recent article by Mike Diamond I want to share this webpage with you - http://www.coinworld.com/news/us-co...edy-half-dollar-collectors-clearinghouse.html
This week's Coin World features an update on this phenomenon. A fourth die pair is now associated with this rotating collar chip and the pattern of rotation is a little less regular than originally reported. While the movement is usually a steady clockwise rotation, it is occasionally punctuated by jumps, freezes, and resets.
Thank you Mike for that information. I will definitely check it out. Thanks for looking at my thread!
All of the same date? 2002P? Now that's an obsession! I have found this thread immensely interesting. I had never considered the idea of a collar break, but reading through the error-ref section on them has been quite educational. Thanks!
Interesting. A pretty high percentage of 1825 half cents show a similar collar break that is usually referred to as an "edge lump." The edges were photographed using an concave mirror.