Noob here! My first few error finds - Dime, Penny x2 - Opinions/Help Please!

Hello everyone! I'm excited to be a new member of your community and would love to get a few opinions on my first few finds.

1. 1984 D -- Defective Planchet? Human Made, Post Mint?
Note: The hole does not quite make it completely through coin. Notice the raised bumps around the date.


2. 1969 -- Grease Filled? Weak Strike? Worn Metal?


3. 1980 P -- ???
Note: Some sort of U shaped scar or defect that runs underneath the letters.


If anyone is interested, I can provide more pictures. Thanks in advance!

 

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Definitely PMD on the first one, probably PMD on the second. I wonder how the person managed to drill a hole in the first coin...

 

First one appears to be zinc rot, or possibly a gas bubble, second appears to be stuck through grease, if thats the case, no extra value, the third appears to have been damaged by a coin rolling machine.

 

Haha... or where that person found a d shaped drill bit.

Drilling was my first impression as well but the hole wasn't circular and there were other weird raised bumps to the left of the one, causing me to think that it could possibly be a defective planchet. It could just as easily be somebody that hates Denver. My crappy cell phone may make all of the details difficult to make out.

 

the first coin is what dsmith23 said it was. our coins after 1982 are zinc with a super thin copper plating on them. if the copper coating gets a bit of damage to it the zinc is exposed to the elements and rots or what we call corroded really fast. when the zinc becomes rotten it swells up and pushes the copper plating up . I don't like these newer cent coins at all because of this. I have found them so eaten away they were not even spendable.

 

Right. Also, vinegar causes this type of reaction on zincolns (first coin). 2nd coin could be struck through grease, but without a pic of the obv. we cannot say for sure. No real premium either way, but I still hold 'em 3rd coin looks more like die polish marks to me... No premium there, either, but for a dime, I'd put it in my 'examples' set.

 

Excellent info. I'd not yet heard of zinc rot or gas bubbles.

 

This makes a lot of sense. The coin appears worn and there are several tiny bubbles on the obverse, not captured in the photo.

 

I'll post a photo of the obverse side later tonight, just for the sake of curiosity.

The dime was interesting because the marks seemed to run through the letters without actually marking any of them. If it had been post mint, I would imagine that the lettering would also be showing damage. I'll definitely be looking at some die polish photos for reference.

 

here is a discussion on die polish marks: http://www.coincommunity.com/forum/topic.asp?TOPIC_ID=115916

 

I can only remark about the first coin, its not pre or post mint damage as one would thing, due to the Zinc core, the zinc rots and the copper plating falls away forming holes or pits. I found dozans of these. if you look at it, it is a 1984 D, the mint mark crumbled away.

 

Regarding the second coin, the weak area on the reverse mirrors Lincoln's bust on the obverse and is caused by the strike not being strong enough to fill in the reverse design area directly opposite the obverse. Lincoln's bust area is the deepest part of the die and when weakly struck, does not allow sufficient pressure to fully strike up the reverse.

 

This thread is 6 months old. I doubt the OP is still around looking for answers, especially because his activity was in July.

 

Too bad because I could give him the correct answer on the dime, heavy flowlining from die wear.