1991-D Lincoln Die Chip? - Coin Community Forum

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Author	Replies: 3 / Views: 868
jedichef Pillar of the Community United States 781 Posts	Posted 09/15/2011 04:05 am Pulled this roll hunting yesterday. at first glance I thought PMD, but after looking at it with the loupe I'm guessing...die chip? cant be PMD because the "D" is still perfect. any thoughts? Report this Post to the Staff

John1 Moderator United States 56855 Posts	Posted 09/15/2011 06:17 am Looks like split copper plating that is starting to rot causing a gas bubble to form,IMHO John1 Report this Post to the Staff
BJ Neff Pillar of the Community United States 526 Posts	Posted 09/15/2011 5:27 pm John is right; a common affect on zincollas! BJ Neff Report this Post to the Staff
coppercoins Pillar of the Community United States 7629 Posts	Posted 09/16/2011 05:02 am The cause of this is usually because the mintmark tends to be a spot where the bevel of the design didn't work out and there ends up being a spot in the design where the relief is straight-up. This causes the die to slice into the surface of the coin like a knife exposing the zinc underneath. When that happens the highly reactive zinc starts to turn into zinc oxide causing expansion, thus a bubble. The bubble often bursts through the thin copper shell on the coin causing these ugly marks. Report this Post to the Staff
	Replies: 3 / Views: 868

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