Types of Die Deterioration Doubling
There really are two different kinds of DDD: Inside and Outside Abraded Die Doubling. This is because Die Deterioration Doubling manifests itself in two different ways. The two classes look different, and are caused by wear in two different places. Inside Abraded Die Doubling is caused by wear around the edges and inside the actual detail affected. It appears as an enlarged, irregular outline of the element overlapping the original design element. Outside Abraded Die Doubling is caused by actual wear in the field of the die. The field of a die is the highest point, so when a mint technician polishes the die or the metal flow of a coin wears it away, the field is the first thing to be worn down. The difference here is that Outside doubling does not overlap any of the original design, but rather appears like an irregular shelf around the object.
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