Kevin
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1962d Franklin Half possible DDO
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I guess I don't understand all the aspects of MD yet. So the doubling, the shearing can actually occur higher up in the relief area? This example does have the shelf-like appearance, but the doubling is further away from the coin surface. The limited examples I've seen the doubling was at the coin surface. That's why I didn't automatically think MD.
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MDD is caused when the dies shift or chatter after striking. The location, direction, and magnitude of the chatter all depend on when and how much the dies move. If this occurs immediately after striking, it will be at the surface as you describe. If it happens a split second later, after the dies have begun to pull apart, the MDD will be in a different place and appear differently. It's still caused by the same thing, and will have the same general appearance - a flat, shelf-like look. The S on your coin has the classic look, although I'll give you that the T is far more deceiving.
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