It looks like Mechanical Doubling that I've seen numerous times on Roosevelt dimes. The coin also has a color (if it is accurate) of one that has been buried and unearthed by a metal detectorist.
I have one exactly the same. I asked about it on coppercoins and was told MD. I kept it for reference down the road I will put it a pic soon as I find it. http://i14.photobucket.com/albums/a...dcp_1783.jpg Gary
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