I'll start off by saying I know this is PMD, but I would like some theories on how something like this happens. I found both of these dimes in pocket change about a year apart, so there is little chance they were created by the same enviernmental factors that they may have come by in their almost 50 years of circulation. The copper on these coins seems to have been eaten away around the rim, yet the nickel parts of the clad is perfectly fine. One of them seems to still even have reeding on the entire rim.
DEFDAM - Definitely Damaged Chemical corrosion. The copper between the clad layer corrodes faster when exposed to the harsh chemical such as acid.
I'm thinking the same thing. I just find it odd that I found 2 similar ones a year apart. Almost like these dimes went through similar situations to be corroded like this. Any chance you could check out my Jefferson nickel I posted yesterday in the "coin roll hunting" forum?
Yes it’s damaged but I don’t think it was only “acid”. Those coins could have been sitting in a cup holder that had coke or some kind of acidic substance that may have ate away at the coin. The make up of sodas is quite a acidic substance that can remove rust and corrosion fairly well... and your coin was in contact of some acidic liquid at some time... IMO....
