doubling or machine doubling?
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8 posts in this topic

    This coin doesn't have either die or strike (machine) doubling.  The faint image around some of the letters is likely due to die wear and is called "die erosion".  The clog in the top of the "8" is a die chip as noted by Fenntucky Mike.  These chips appear frequently on cents from the mid to late 1950s and early 1960s, and there was a fad of collecting them decades ago, though not lately.  The deformity of the "I" and "B" is most likely damage.

   Of the various forms of doubling that can appear on coins, only a true doubled die, where the doubling is the result of improper die manufacture, may have value in the numismatic market. Such doubling is usually on one side of the coin and is found on all specimens from the die.  The doubling is clear and has about the same depth as the primary image.  The 1972 doubled die cent shown below is a good example. Note the crisp, clear doubling of all of the letters and numbers on the obverse, while the reverse is normal. 

2121120254_1972DDcentobv..thumb.jpg.9c5775ef89576682bd8bf39ec59eb2a8.jpg1540660528_1972DDcentrev..thumb.jpg.0a4cb2395766ccdd68d09210ed2389c6.jpg

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On 9/28/2022 at 9:25 AM, Sandon said:

Of the various forms of doubling that can appear on coins, only a true doubled die, where the doubling is the result of improper die manufacture, may have value in the numismatic market.

The attached diagram really helped me in understanding the difference between common machine doubling (aka "shelf" doubling) and more valuable doubled die errors or attributes. Also keep in mind that sites like eBay have countless coins with common machine doubling being falsely represented as having more valuable doubled die attributes.

Coin Errors - Doubled Die vs Machine Doubling Diagram.jpeg

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