Found this last night while copper roll hunting. Did some searching and couldn't determine the error type. Its not a clash but rather a fused extra layer of copper, like some reverse side chunk that got stuck to the dies and then was fused to a later planchet via strike? Reverse side has more of what appears to be a bubbly gluey substance. This residue could likely be removed but not until I understand what this frankencoin is. Obverse is pretty sweet. Any idea of how this occurred or of possible rarity/value?
Oh rats just epoxy?! Weird that the designs could transfer so clearly. Looking closer I guess it looks like only glue residue but not yet 100% coinvinced.
You can try water, isopropyl alcohol, and acetone for common glues. CA and epoxy glue can sometime be removed by putting the object in a zip lock and in the freezer for a day and then see if the glue pops off due to the differential expansion/contraction rates between the metal and the glue. Heat could do the same thing and I use it to separate gemstones that have been glued to metal object with CA, but not advisable on coins But likewise I am certain it is glue also.
I thank y'all for the quick sharp diagnosis, that's why I love this place. However I am going to slap it in a flip and hold onto it for now, because I am not 100% on epoxy theory, something about it just doesn't add up and I don't want to jack it up with improper cleaning.
An acetone dip will not harm this coin. Acetone will only remove gunk and stuff that was never part of the original coin. One thing to think about when discussing errors is thinking "how could this have happened at the mint?" In the case of the coin in this thread, the appearance of the anomalies can't really be attributed to anything that could happen in the striking chamber.
