Quote:After the production of the famous 1955
Lincoln Cent Die #1 doubled die variety with an extremely strong spread to the doubling, the Mint took measures to prevent such widespread doubled dies from ever happening again. They placed lugs around the rim of the dies and hubs so that the images on the hub and partially completed working die would align properly when they were placed in the hubbing chamber. These lugs were raised on the working die and they were depressed indentations on the working hub.