This was caused by problems with the plating process and is most common on cents minted in the 1980's, but can be found on any cent minted after 1982 when Copper plating was first used. Gas bubbles would become trapped beneath the Copper plating and cause these raised areas. They seem to be more common on cents from the Denver mint. Solid-alloy cents minted in 1982 and earlier can have occluded gas bubbles caused from heat generated when a planchet is struck. The expanding gas pushes a layer of metal towards the surface of the coin, resulting in a raised area or bubble. Occluded gas bubbles are much rarer than the blistered plating found on newer cents.
Internal Metal Displacement / Progressive Indirect Design Transfer
In early 2000, 10,000,000 newly struck cents were sealed with plastic on cardboard cards and placed into boxes of Cheerios cereal as a way of promoting the new millennium and the new Sacagawea dollars (5500 of the cards had the new gold colored dollars on them along with the cent). The Sacagawea dollars that were placed in the boxes are highly valued by collectors as they were made with different dies than the coins minted later for circulation. This was not known at the time of the promotion.
Photo By Lincoln Cents Online
Lincoln cent die that has had the face ground off by the mint.
Another example of a defaced Lincoln cent die.
Photo By Jon Sullivan
A sheet of metal stock after it has had the cent size blanks punched out of it.
Photo By Jon Sullivan
A steel cent planchet strip from 1943 measuring 3.75 X 5.75 inches after it has had the cent size blanks punched out of it. Most of the scrap Steel was send for recycling but this piece found it's way into a collector's hands and was saved. Most pieces like this show signs of abuse and some rust.
Photo By Jon Sullivan
After the blanks are punched out, they are put through an upsetting machine that puts the rims on them to form planchets.
Photo By Jon Sullivan
Photo By Geoffrey Noe
Photo By Jon Sullivan
Photo By Troy Moxley
Original bank wrapped rolls are rolls that were wrapped at a bank from original mint bags of newly minted coins. These rolls will usually have the name of the bank printed on the roll. Be aware that many sellers will advertise rolls as being OBW (Original Bank Wrapped) when in fact they are machine wrapped and could have been previously searched for errors or varieties. Sometimes by looking closely you can see if one end of the roll has been tampered with and reseated to look original. When this is done, one end will normally be loosely wrapped. Original rolls are tightly wrapped.
Photo By Lincoln Cents Online
A bag of 5000 cents directly from the mint. Coins used to be shipped to banks this way.
Photo By Jon Sullivan
Photo By Jon Sullivan
Split plating occurs on some devices facing the rims on Zinc cents.
Photo By R.S.Cooper
Photos By Ed Lott
Photo By Heritage Auctions
Photo By Heritage Auctions