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ATA Chapter #94

ATA Chapter #94
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14. One or more colors leading to the completion of a stamp is fully offset on the reverse of the stamp by the blanket roller: Compared to a stamp that has part of a design on the back in reverse due to two stamps sticking to one another and then being pulled apart, this error is a smooth, even impression well-centered on the back. It is most often found on U.S. stamps produced between 1957 and 1980 on Giori-type presses using pregummed paper. Sheets from a stack were drawn into the press one at a time. If the mechanism failed to draw a sheet into the press, the inked plate would apply the design on the blanket roller, the function of which was to maintain a consistent pressure from behind the sheet so its face would pick up a constant impression from the plate. The next sheet through the press got not only the proper print on the front but an attractive print in reverse on the back. For the most part these are not scarce and are priced in the $40-$50 range per stamp.

Type 14: This U.S. 4¢ St. Lawrence Seaway stamp (Scott 1131) shows a full blanket roller offset on the back.

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