Double mint mark error?

I have this 1984 D penny and there is something rising above the surface, to the bottom right of the D mint mark. I already gave it a short 15 minutes or so acetone bath and it doesn't come off, and through the loupe it is definitely a part of the penny rising up above the surface.

Is this a double "D" mint mark error? Any idea on value?

And, the coin is pretty dirty, I know... Thanks in advance!

 

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I think it may be a RPM (repunched mintmark), though sometimes when a coin is dirty it is harder to see any suspected error, making you think that something looks like an error when it is really not. More close up photos of the mintmark would be great.

 

It looks like plating issues to me.

 

All of that "blackening" almost leads me to believe a torch was taken to it.

 

Here are multiple angles of the D mint mark.

If I rub the black stuff really hard, it comes off. Not sure it's a torch. It's looks greasy yet hard and it's on top of the surface. The last picture shows what I mean.

 

Mc don French fire grease ? Between seat's

 

Mickey D's french fry grease? I don't know, but I bet I can scrape off that crust. I don't think it's advised though. Can anyone tell if that is a double D?

Or, is there a different solution I can put it in to dissolve the crud or whatever is on top so I can take a better picture?

 

I'm not sure, it may be, I cropped the photo of the date/mintmark area. Maybe someone can help...

 

I was able to get some more of the gunk out and the thing next to the D rising above the surface is still there.

 

It's a plating blister that burst around the mintmark. Quite common.

 

On the letter R of the obverse in the word Trust, there is a circle area rising above the letter R's surface at the top half of the letter. Is that a plating blister, too? The same thing is littered all over the reverse of the coin.

 

I agree .
1984 Denver and Philadelphia coins were all having problems with copper bubble.

 

Zinc rot.

 

So I have a zombie cent!

 

how about this one?

 

I agree that there were certainly plating issues on this year and others but you have nothing to lose by cleaning it at this point. Hang on to it until you can have an expert opinion rendered. If it is an unreported D/D you will still have something special. I can't agree on a re-punched M/M as I thought the mint did away with that some time ago. And at this point it's not worth the expense to have certified so hold on and visit a coin dealer or three and get another opinion.

 

While just a student and still learning, based on pictures it's a plating blister imo. Worth 1.3 cents....I think the Frisco kid wrote an excellent piece on doubling.....check that for tons of info.
check page #32 of STRIKE IT RICH with pocket change===plating split doubling...(non collectable)))---
Just my opinion, keep posting pics

 

Ooh, I'll have to check out that book. It seems the book has good reviews on the 'net, too. I'll try to remove more of that gunk, just wish there was something I can bathe it in to remove it.

 

It looks like a Plating Blister. As far as something other than Acetone, try one of the paste type Paint Strippers (not the Environmental kind as they use slow-acting organic materials) like Klean Strip that use a blend of inorganic solvents (e.g. toluelene, MEK, Mineral Spirits) and sometimes an Alcohol. These are very aggressive on just about any material except metals and metalallic compounds. I would apply with a Q-Tip to only those areas that have a residue, and follow up--after about 15 minutes--with a Toothpick to gently dislodge the residue.