what happened here?

[walkingdude]

Any idea what happened?

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This is a 1987d and it only happened on the reverse.

[smed]

Looks like die fatigue to me.

[walkingdude]

Which would mean that the surface of the die starts to reduce and let the letters/numbers come closer to the coin's surface?

[Dick]

Gentlemen, I don't think it is die fatigue. The letters are too clean, and clear. It does look like they might have been skidded into position. I still have the idea that it can happen just as the planchet is being "settled" in the collar, or chamber, and gets the "hit, an instant before the strike is made, and the coin ejected, causing the first impression, then the final strike.
Dick

[coop]

When looking at a die, the field is the outside edge of the die. The details like numbers/letters/design are deep into the die. So when the field get ruffed up, it leaves the area of the field looking just like the die. The letters/numbers/design is not touched by cleaning and damage from die clashes. Wear usually appears first in the fields forming a die flow pattern. Minor at first, later as more coins are made strongest. Looks like the die field may have started to wear/crumble in that area of the field. So the letters would not be affected till they start to wear from striking which can start to be noticed in MDS coins. The LDS coins the letters/numbers stop looking rounded. And in VLDS the edges of the letters/numbers wear so much that they look like snow drifts between the field over the devices. So each die state is noted by the wear of the devices stronger and stronger till the die is retired.

[walkingdude]

Thanks Coop,
I've never seen one so deep.

Snows drifts, tell me about it, some are like avalances.