1951 D Large Cent Error?

Not necessarily. You need to take into account that many coins have a plus or minus varience in weight. The Cent in question could of originally weighed 3.14 grams as an overweight planchet.. the removal of the metal on the Reverse side could then bring it down to the correct weight of 3.11 grams. So your reasoning is faulty.

You ever heard of a Rolled Thick Planchets?
http://www.error-ref.com/rolled-thick-planchets/

 

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Accurate weight may not tell you anything at all. It is possible to grind off the entire rev and still be within legal tolerance. (helps if the coin was slightly heavy to start with.)

 

He might well be. But betcha he don't know as much of '89 no-P as does yours truly

 

Where's OP ???

I 1st asked the correct Q's to close this case...

I surely disagree with that Conder ; I don't believe you could grind down entire reverse, and not reduce weight SUBSTANTIALLY - to reach a conclusion on it (or keep case open).

 

Hmm. I have what appears to be a similar coin sitting in acetone as I type this. My excitement over it is rapidly waning.

 

Cleaning coins is not a good idea . Removing the original toning sometimes makes it hard to determine if some types of error coins are real or altered. That is what I like about the OP'S coin in this thread , it has a nice looking dark brown color on both sides that appears to be the original toning. This can take many years for a coin to get this deep toning unless someone fakes it.

 

A WINNER, expat ! OP used 'large' as adjective, not as pronoun - a 'large' error.

It's a sad state, that web nazis will get after common types, whereas, if they went after politicians with the same zeal, the affairs of this nation would be far better...

 

I wasn't going to reply to this as I have no opinion or experience of affairs of state of the USA as I am an English expat living in Spain.
I was not denigrating paddymans answer I was trying to point out that the OP should have stressed the words in his title differently.
As an example, LARGE cent error reads differently to LARGE CENT error
However, in defence of @paddyman98 and others, I have to say that after reading hours of posts that deal with mostly the same subject, and written with such appalling spelling, grammar and punctuation, that it is easy to mis-read that which the poster has written. Add that to the fact that multiple posts regarding the same thing, on different coins, with no apparent willingness of the posters to actually click on the links provided by members to further their education and knowledge, and it is no wonder that people get frustrated. Their willingness to help is tempered by not really having an accurate description of exactly what the OP needs help with.

 

Thanks for the correction. I edited

 

Acetone doesn't remove toning. Acetone is a solvent and will remove many types of dirt and organic gunk including PVC plasticizer residue. Acetone DOES NOT remove metal.

Your general comments are applicable for chemical or abrasive cleaning, but if you aren't sure about a topic, it may be best to refrain from commenting so new collectors don't pick up on erroneous information.

 

Talk like this is why you are on my ignored list. I'm sure glad CT has the ignore feature.

 

No problems. Just trying to make sure new members are confused

 

You have to be kidding, right?

Oldhoopster was correct and you are incorrect. You put people who educate and use facts on ignore? Sad.

 

Now why would you want to make sure new members are confused? I can't believe you told the truth.So this is why you act up with new members.

 

No I was not kidding , Oldhoopster needs to lean to stop belittling others. And you are dead wrong here . I only said cleaning coins is not a good idea so I was not wrong . I only have a few on my ignore list so there is room for a few more that tries to mistreat others.

 

Obviously, it should read "Just trying to make sure new members are NOT confused". Thanks for pointing out the typo so I could correct it.

 

Splitting hairs you are. Acetone is not cleaning, but you implied it was. Any other way cleaning may or may not be acceptable. Excuse me if I triggered your anxieties.

 

Maybe someone else will come along and share their thoughts on coin cleaning. Maybe acetone would be ok for gold or silver to take a short dip in it if the user knew how to rinse it off and dry it the right way.The coin in this thread is copper,acetone could harm copper toning by discoloring it.

 

Some of these guys say PMD. I think I saw someone say...someone machined it off to make it smooth. In that case, it would not weight 3.11g Check the weight first, then come back to use with the actual weight. Thanks!

 

Acetone will not harm any coin. The reaction of copper with acetone is anecdotal and does not happen in all cases if in any.