I was unable to find an exact match for this at coppercoins nor lincolncentresource. Please tell me what you think.
At the time of the strike the die causes a fault in the copper plating along the edge of a design device. The copper plate instead of flowing splits along the fault. Coinage plate tectonics so to speak.
I have just a few like that in my bu roll of 87-D.and it were air was stuck in the planchet.after they punched the mint mark the air pushed thur.as that area was the thinnest area on the coin.
OK, call me stupid. But I clearly see inside the mint mark the back of the D with the serif as well as the curved portion outside to the east and southeast. I sure looks like a stamp and a stamp over. I don't understand how it can be such a precise air bubble following those exact lines. I mean, since it is an air bubble in the lamination, what caused it to hold the exact shape of the D underneath the Mark ? The angle of the 2 D's is also confusing to me. I don't understand why if it caused by suction of the die being removed the mark is rotated. I mean doesn't the die go straight up from the surface of the coin ? I am not trying to be argumentive at all. I am just trying to understand the actual mechanics of the process. I have never watched a coin being stamped, and my knowledge only comes through interaction with you guys and what I can read for myself. But as I am asking, how could an air bubble in the lamination follow such exact lines ? Thanks for everyone's patience, Gary
Another question I have is why these defects always seem to occur around the year or the mint mark. There doesn't seem to be any posts of it happening at say the designer's initials or the lettering. Thanks again.
