I have a 1997 p quarter with a lump bump or swollen area on the back side. Front side looks normal back side looks like an air bubble raised up about 1/8" running from eagle head out towards edge of wings extending down to the coin edge. The striking on the coin do not look deformed at all, circular shape of the coin is not distorted either. It looks pregnant with the lump rising from just under the head and increasing in height to the feet and then tapering to the edge. No real discoloration on the coin either' if it was heads up you couldn't tell other than it is tilting up due to the back side lump. What do you think has happened. Thank you
Answer Hi Chris,
Modern coins are a "sandwich" of copper core and nickel outsides. This is a case of de-lamination. I have seen this numerous time where air bubbles cause this deformity.
Nice oddity but not much value as it is somewhat common.
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