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Canal Zone Precancel Rolling Pin:
In 1939, when the postmaster at Cristobal in the Panama Canal Zone needed to cancel a large number of stamps, he attached a rubber printing mat to a kitchen rolling pin. In 1979 the Canal Zone Postal Administration transferred its collection and archives to the Smithsonian Institution -- including this rolling pin.

This wood and rubber handstamp was used at a Cincinnati, Ohio, post office in the 1930s. One impression precanceled an entire pane of 100 definitive stamps.
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