1991 DDO

The date is doubled, I'm not sure of any of the lettering yet

 

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Die Deterioration doubling IMHO

 

It’s zinc and this type of doubling is common to the zinc planchets. DDD

 

@paddyman98 @Collecting Nut
I'm certainly not arguing with you all but may I show you my reference? Hopefully I'm not misunderstanding the references I have.

 

Sure, maybe we can help you understand them better.

 

Ok. http://www.lincolncentresource.com/doubledies/Top50DoubledDies.html

 

I was comparing the day to the date on 1972 DDO penny from here. Why are they not the same kind of doubling?

 

date*
Not day

 

Dorry but all I have is a cell phone and that’s way to small for me.

 

That is the link to the website.The Lincoln Cent Resource

 

You need to compare tour coin to other coins with the same date and mint mark! I'm not seeing a DDO on your coin! Variety Vista doesn't show a DDO for 1991D!

 

Ok. I am using the page incorrectly. Thank you @1stSgt22 you cleared up my thoughts on if I was using the site wrong, I would explain but I don't want to seem like a complete dummy.
And to be clear I meant DDD not DDO
I do apologize for the confusion I've caused. Sorry

 

Not a dummy at all, and no apology required! Honest typo just like me typing "tour"
instead of "your" in my comment! Keep looking and posting! It helps others learn too!! I think your coin is PMD not DDD!

 

What could cause something to double only the date post mint?

 

I don't see any doubling in the picture that's why I said it is PMD. However, I noticed @paddyman98 said it is die deterioration doubling and he knows a lot more about doubling than me so go with what he said! lol

 

think of those webpages as very stringent rules.

A 1972 - 001, etc is very specific to a certain run of a reverse and an obverse die set on even a particular machine for a short time. It's not even all 1972 cents, nor all from the same mint which has multiple machines running at the same time. It has no relation to any other year, or other mints or even other dies (look at the die numbers for the 1972s) which may have a life span of just a few days before being replaced. Of course that does not take in to account Die Deterioration, or loose equipment (mechanical doubling), etc. or at what level a doubling may have been made.

If each "error" was related to a particular mint and year, then it would just all be the same. Then every 1972 D would have the exact same error, which would make it common and not even worth looking for because it would be on each and every one.

So using a 1972 as a reference for a 1991 just doesn't work, especially when during that time frame the composition and the die manufacturing process was completely changed. The 1982 cent composition and 1986 going to a single squeeze method for dies. and all the issues related to the zinc cents.

I think as example, Denver in 2011 could produce about 200 million cents per month, 500k avg 3cents per die side. So that is about 400 dies being used in one month. One press can make about 300k per 8 hour shift. And the mint of course has multiple presses. These numbers are rough taken from reports. Denver currently has about 64 presses of which only about 50 are active .. or something like that. Anyways, that's a lot of dies of which you are normally looking for a particular cent made from one die (that aren't scooped out and trashed) for those more rare ones. There's a lot of variations dependent upon various doubling at what level of die manufacturing.

 

I think the question is .. what would make it look like doubling on a cent made after 1982.
The answer is the copper plated zinc cent. There's a lot of reactive stuff that can happen and the copper plating can bubble up or corrode down or just plain eat itself.

 

Where I was making my mistake was thinking that it wasn't specific to a one certain coin. Thank you for clearing that up. I really need to buy more literature for references. I only have 4 bookmarks in my phone I've been using. Does anyone have a cherrypickers guide they are willing to part with?

 

how can I reference this 1991 to see if there is actually an error occurring? Just for a learning experience for me. Where would I look?

 

You dont see the doubling on the date?