1987-D Interesting Phenomenon

[mustbebob]

I love it when my firmly-held assumptions are punctured.

As I have said a hundred times, we all learn something almost daily, no matter how long you are in the hobby, or no matter how much expertise you have. This thread is extremely enlightening to me. Well done folks.

[hasfam]

Now to translate it into english

[mikediamond]

With George's coin in hand, I can now verify that the incuse die deterioration doubling has been transferred to the design rim on the reverse. In addition, a tiny bit of the die-struck second S of STATES can also be seen at the internal margin of the design rim.

It would take a significant lateral shift for the design-bearing portion of the die face to reach the design rim of the newly struck cent. Couple that with the tight constraints imposed by the collar and I'm thinking that this might be a verifiable case of ejection doubling instead of doubling caused die bounce. There are no other signs of die instability and the coin's diameter is normal (an abnormally wide collar could permit greater lateral movements). Definitely worth a write-up in Coin World. Thanks, George.

[georoxx]

You're welcome. I look forward to the read.

-George

[mikediamond]

I just thought of another possibility. It's possible that the obverse (hammer) die did bounce and shift laterally, but the with the newly-struck coin clinging to it. As it descended, it met the anvil die that was rising up to the top of the collar for purposes of ejection. This would explain why there's no smearing of the impressions, as would be the case if the coin had resisting being pushed off the anvil die. This explanation would also come in handy should I ever encounter a coin with very offset machine on the face struck by the anvil die.

Have any of you encountered any coins in which the reverse face shows widely-offset push doubling, slide doubling, or rim-restricted doubling?

[georoxx]

I'm going to hijack my own thread with a different pic. Different coin. Same anomaly.

This time, 1989-D obverse.

-George

[jallengomez]

This appears to be a different phenomenon all together, and one that is caused by metal flow and the deterioration of the dies.

[mikediamond]

Here's the article on George's coin:

http://www.coinworld.com/articles/faint-letters-on-reverse-rim-may-point-to-hit

[thecentcollector]

Awesome. Still nice to see my original 1994 cent used a reference in this case ;)