2020 CUD SHIELD CENT

Finally added this to my error collection. 2020 Stage 3 cud it’s stunning in hand.
It’ll join my precud and stage 2 cud of this error.

 

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That's a big one.

 

I wouldn’t call that a cud. I would call it a lamination. A cud is formed when a piece of the die breaks along the rim and the minting process fills in that space. This starts at the rim and goes towards the center of the coin. As you get nearby the date you can see metal raised with sharp edges as if was torn.

 

If i do recall correctly laminations are impossible and don't exist on zinc coated cents.One has never been verified and most likely never will i agree with @Gorham_Collector.

 

This is a cud here’s the precud of it also my stage 2 example and an article on the cud from a coin world article by mike diamond

 

The difference I see is in the three examples you posted referring to the three stages, they go all the way through the rim to the edge of the coin. The example you posted does not do that. It stops short.

 

Then if what you say (laminations on copper coated zinc cents are impossible) then this would be damaged before being coated. You can see zinc there.

 

?this isn't damage it's a cud laminations only occurred on copper cents not zinc.

 

"Can't we all just get along." It's just a question, BE NICE.

 

Looks like a cud to me. Carefully check the edges of the raised area. If there is a crack (edge opening) along one edge, I'll accept it as a 'lamination'. Otherwise it's a cud -- and a great one at that.

 

I can see displaces metal near the date.

 

Not sure what you are saying. First it was
“If i do recall correctly laminations are impossible and don't exist on zinc coated cents.One has never been verified” and you added that “most likely never will I agree with”. Then in another post you stated it’s not damage it’s a cud laminations only occurred on copper cents not zinc. Please be cleared as I don’t understand.

 

Just screw it we're ruining this thread.

 

It's a cud

Laminations occur when there are impurities or poorly mixed areas of the coin alloy. The core of the current Lincoln cent isn't an alloy, it's 100% Zn. There is still the possibility of the zinc being contaminated, but you've eliminating most of the potential for laminations by using unalloyed Zn.

Any separation between the zinc and copper would be a plating issue (plating blister), not a lamination. Also, I would not expect to find a lamination within the copper plating due to the thin layer (8 microns/0.0003") and if it did, I think it would be classified as a plating defect

Technically, @potty dollar 1878 is incorrect because it's possible to have a lamination on a zinc Lincoln cent, it's not very likely.

 

Its a pretty rare event yes your right and technically nothing is impossible,i found a nice rim burr on a zinc cent.

 

Nice one!
What does the reverse show in that area?

 

A 'cud' is where a chunk of the die has broken off/out leaving a place that SHOULD be part of the design but had nothing to strike that area. It is true that far the most cuds occur at the edge, but an 'interior cud' occurs when a chunk of the die breaks out away from the rim. See an example below. I can show others.

 

It’s a normal reverse surprisingly

 

Just for the record, the mint had the vendor change to 97.5% Zn 2.5% Cu in 1986 or 1987 to make the plating adhere better.

 

Do you have a reference link? All I've been able to find is the cent is 97.5%Zn 2.5% Cu, not specifically the core. It does seem that 2.5% may be high for the plating, but I haven't found anything saying the zinc is alloyed with that much copper, nor anything about a comp change later in the 80s

I found this in an old CT thread. It appears to be a quote from David Lange's book
A practical solution was found in a cent planchet that was nearly pure zinc, with just a thin copper plating. In fact, the zinc base was .992 zinc and .008 copper, the trace amount of copper being included to facilitate bonding of the copper plating

This is the entire thread. I copied part of post 3 above
https://www.cointalk.com/threads/composition-of-the-1982-cent.25829/

I also checked out the Cu-Zn phase diagram and it looks like adding 2.5% Cu would yield zinc and a Zn-Cu alloy (epsilon brass or epsilon zinc?), not a homogenous alloy. (The 0.008 Cu referenced above does appear to be a homogenous alloy)

Thanks