Four bar cancel

A Four bar cancel is the descriptive name for a well-used type of handstamp duplex cancel favored in the US. It was used from the 1920s to the 1970s and beyond. The killer/obliterator portion is 4 bars, usually quite heavy. Since the type was used for so many years, there are many, many styles and usages of it.

 File:USS Hull 4 bar.jpg|1977 USS Hull' cancel. 

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