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1983 LMC Please Grade, Also Have Questions Re: Zinc Bubbles, Over Polishing

 
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Author Previous TopicReplies: 6 / Views: 207Next Topic  
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 Posted 01/25/2021  7:42 pm Show Profile   Bookmark this topic Add shantiom to your friends list Get a Link to this Message
As the subject implies, Zinc Bubbles are evident. Does this happen to the Coin after it leaves the mint, or does it exist on the Planchet, if both, then how does there precense impact grading--poor eye appeal, or also indicative of surface quality of the coin. Further, the lines prominent on this coin, is this due to over polishing?



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 Posted 01/25/2021  7:59 pm  Show Profile   Bookmark this reply Add Adam_E to your friends list Get a Link to this Reply
The plating blisters occur during the strike due to a poor bond of the copper plating to the zinc and the expansion of gas within the two layers from heat. These blisters will affect eye appeal and the grade depending on the severity.

Here's a good writeup on those: http://www.error-ref.com/blisteredplating/

The lines as you correctly pointed out are caused by die polishing, there also evidence of extensive die wear on this coin, as well as the large die crack on Lincolns head. It's no surprise extensive polishing was necessary considering the tired state of the dies.

Looks to be in pretty good shape though, I'd say 66RD
Edited by Adam_E
01/25/2021 8:01 pm
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 Posted 01/25/2021  10:19 pm  Show Profile   Bookmark this reply Add Rothery to your friends list Get a Link to this Reply
Also may have something to do with zinc dust not being cleaned thoroughly enough off the planchets. There are alot of topics about this problem if you put "Zinc Dust" in the search box.
Here's just one example.....
http://goccf.com/t/373982
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 Posted 01/25/2021  11:27 pm  Show Profile   Bookmark this reply Add Greasy Fingers to your friends list Get a Link to this Reply
Also a ridge ring is starting to show on obverse and limited amount of steps on reverse tells indication of later die states...nice looking cent for its age...66 seams close/right
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 Posted 01/26/2021  04:57 am  Show Profile   Bookmark this reply Add John1 to your friends list Get a Link to this Reply
Does that coin qualify as a spike head?
John1
( I'm no pro, it's just my humble opinion )
Searched 5+ Million Cents Since 1971
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 Posted 01/26/2021  08:04 am  Show Profile   Bookmark this reply Add ijn1944 to your friends list Get a Link to this Reply
Yes, is that a die crack--head to rim on the obverse? Appears to lead to a cracked skull. Cool.
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 Posted 01/26/2021  08:29 am  Show Profile   Bookmark this reply Add shantiom to your friends list Get a Link to this Reply
Yes, I can confirm the crack from rim to back of skull, thanks all for flagging...does this constitute a variety, with or without a premium.couple bucks?
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