Error coin post 1: What type of error is this?

jmcu12 · October 27, 2003 8:46AM

This is part of a three coin set, from the mint with an error on the middle issue. What type of error is this, the discoloration is in the shape of a coin, but I am not sure how this would have got there.

The discoloration looks to be part of the metal, at least at 10x magnification.

Ideas?

Rampage · October 27, 2003 9:18AM

Interesting. Not sure what type of error it is. Does NOT seem to be partially missing clad, but maybe I am not seeing the scan right.

I would suggest asking Mike Byers of www.mikebyers.com, or even Dog97, a member of this forum.

supercoin · October 27, 2003 9:27AM

Hmm... I would say a sintered-coating error, where some copper dust left over from some cent blanks sticks to the blanks used by another coin (an SBA in this case).

Except if that's what it was, the copper should be in a crescent shape, with the area protected by another SBA blank remaining brilliant.

So I don't have a clue. Interesting coin!

CoinAddict · October 27, 2003 9:28AM

It appears to be a copper wash. According to the book "The Official Price Guide to Mint Errors" a copper wash is a thin layer of copper adhereing to a coin or other object as a result of being dipped in a solution containing copper. It is also know as a sintered planchet. a sintered planchet is defined as a planchet which was stuck in an annealing drum and was partially or completely coated with sintered coin metal dust.
Hope this helps some. Of course you will want other opinions.

supercoin · October 27, 2003 9:34AM

As you note, copper wash and sintered coatings look similar but happen in completely different ways.

But I'm not sure how copper wash could explain it either. Maybe one blank got some contaminated wash water on it, and later rested on another blank, and the contaminated water then formed the coin shaped pattern? I dunno... not sure there'd be enough copper in just a little contaminated water.

lathmach · October 27, 2003 9:58AM

Coffe stain.
Decaf, no cream or sugar.

Ray

Conder101 · October 27, 2003 9:48PM

After the planchets are annealed they are cleaned to remove the oxide coating that forms from the heating. If two planchets stuck together somehow they coud prevent the oxidation from being removed in just such a pattern as seen here.

supercoin · October 28, 2003 3:47AM

That sounds like the best explanation so far, but how are they cleaned? I'm having a hard time visualizing how they could remain stuck together if the cleaning process was at all vigorous.

mgoodm3 · October 28, 2003 4:14AM

Grader with big thumb and a chocolate donut. That's my best guess.

Error coin post 1: What type of error is this?

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