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1955 double die reverse

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You do not have a double die. You have what is known as strike doubling. When the double is a flat shelf and came from metal in the letters (that is the letters are thinner than they should be) it is strike doubling. It is a very common occurrence and not worth any additional money. As a matter of fact it makes the coin less desirable. A true double die occurs when the die is doubled during the die manufacture. When it is struck you will see the proper size of the letters and additional metal.

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Yes, classic machine doubling on those letters, it is a good image. It's also called 'ejection doubling' and for the most part caused by vibration in the coining press. On e-Bay, there have been oodles of so-called 'double dies' being pawned off on unsuspecting buyers when in fact the real term is called 'doubled die' variety.

 

You could sell it as an interesting and novel piece that exhibits classic 'machine doubling' start it out as a true auction and see what it might fetch.

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Yes, as other have already stated, this is strike doubling; also known as machine doubling, or even die bounce. The dies bounced at the moment of striking, catching the edge of the design and making a shelf.

 

The easiest way to determine that you do not have a doubled die is to look for splitting between the two images, rather than a continuous albeit stretched line.

 

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