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Message:: [QUOTE="Clawcoins, post: 3435403, member: 77814"]There's multiple ways that metal fatigues, wears out, etc.But, look at one of your pictures[ATTACH=full]911936[/ATTACH] you can see the "expanded" section surrounding the letter. Generically speaking, a "standard" Double Die is when the hub is pressed back on to the die not quite straight on and creates an "offset doubling"  So the "added" letter would be offset, not expanding the entire circumference of a letter (there are 8 categories of DD though). In this specific case, as the die's inset "letter" sharp, 90 degree edges wear, they expand around the circumference.  So Die Deterioration in this case. The metal die strikes against hundreds of thousands of planchets.  Each planchet is new, and if you were able to grab *all* the coins from one set of dies, you could technically put them in order of the first batch to the last batch struck by the die by how "early die" sharp and detailed the image is, to how "late die" soft and DDD the image gets.[/QUOTE]