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Machine doubling (MD)
Push type
Sometimes called: mechanical doubling, machine doubling damage or strike doubling.
At the end of the strike, displaced energy manifests into either oscillation or a rotational movement between the struck coin and the die face. This can lead to additional contact, post strike, on a localized part of the struck coin, or on large parts. It can be minor or significant. It can occur on one side or both.
The results of machine doubling show marginal shelf like doubling where parts of the device are pushed down. The push can be minor to severe.
Light machine doubling:
1983-MDDa-01.jpg
Stronger machine doubling:
1983-MDDb-01.jpg
Notice how it cuts into the normal size of the device. There will be NO notched corners or true separation:
IMG_8865.JPG
It can even be very severe as it cuts across Lincoln's face:
IMG_4305 copy.jpg
And it can be tripled or quadrupled:
IMG_3304.JPG
Push type
Sometimes called: mechanical doubling, machine doubling damage or strike doubling.
At the end of the strike, displaced energy manifests into either oscillation or a rotational movement between the struck coin and the die face. This can lead to additional contact, post strike, on a localized part of the struck coin, or on large parts. It can be minor or significant. It can occur on one side or both.
The results of machine doubling show marginal shelf like doubling where parts of the device are pushed down. The push can be minor to severe.
Light machine doubling:
1983-MDDa-01.jpg
Stronger machine doubling:
1983-MDDb-01.jpg
Notice how it cuts into the normal size of the device. There will be NO notched corners or true separation:
IMG_8865.JPG
It can even be very severe as it cuts across Lincoln's face:
IMG_4305 copy.jpg
And it can be tripled or quadrupled:
IMG_3304.JPG
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