Coin and Paper Money Collecting/quarter oddity



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

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.

Best regards
Joe Hylas

Coin and Paper Money Collecting

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Joe Hylas


Numismatic professional with over 30 years experience can answer your questions about US coins, their values, how best to sell them and where to buy them. Interested in starting a collection? Find out which areas are undervalued and how to acquire those coins at the best price.


Ex-Head Precious Metals trader for Deak-Perera International with 42 offices worldwide. Industry experience since 1978. Has worked co-operatively with US Mint, Royal Canadian Mint, Austrian Mint, Chamber of Mines of South Africa, World Gold Council and Platinum Guild International. Professioanl numismatist specializing in US Coins. Always buying collections, will travel if size of collection warrants. Website: www.AllCoins.US

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