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Any "blob" or "extra metal" effect on a coin resulting from a sizable portion of the design on the die that struck the coin having fallen away or simply "moved" on the die itself (a.k.a. "retained cud"). A cud is distinguishable from a die break in that a die break is usually considered smaller and typically forms from a die crack.
List of known Cuds and Rim Cuds
Typical Minor Rim Cuds
Appears on any point around the rim and does not reach the field of the coin.
1887 o vam13a mhi92273obv.JPG
Typical Retained Cud Crack
Die Crack connecting at 2 different points
RDM 1898-P Vam 2b Rev b 022114.jpg
Typical Retained Cud W/Dispacement
1921-P VAM-19A Cud AMERICA.jpg
Die state evolution
Typical Cud
When found, cuds are often in and around the rims, earning the specific name "rim cud".
The most famous Morgan Dollar cud, which happens to be a rim cud, is found on the 1921-D VAM-1X:
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21 d vam1x coin.gif
In order for a variety to be listed for a rim cud, the cud must extend into the fields, not just into the denticles.
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