Offset

There are two meanings:

1. A stamp with the transfer of printing from another stamp or object which then appears in reverse. This is more often called setoff in the stamp world to avoid confusion with the printing method described below. See: setoff.

2. A printing method, more fully named offset lithography, is where an inked printing plate transfers an image to a rubber roller which then is used to print sheets of stamps, among other things. It is probably best known for its use with the United States Washington-Franklin issues of 1918-20. Like lithography in general, the printed image and look is flat. Like most lithography of the period, details are relatively coarse. Certainly, there is a huge contrast in image quality vs. engraved stamps of the same period. On the other hand, offset lithography would be a cheaper process including less plate wear and replacement, and was probably faster as well.  File:US 3c Wash offset ty4.jpg|US 3¢ Washington offset printing. Compare with the engraved stamp at right. File:US 3c wash engr ty1.jpg| 

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