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| | United States Postage stamps. History |
 | | As provided by law, these stamps were designed to be issued to postmasters on account, for sale to the public, thereby providing an accurate and automatic check on the postage revenues, in lieu of the less uniform and more uncertain methods that had prevailed in the past. |
 | | After the introduction of postage stamps, these various methods of mailing without stamps affixed continued to be legal until the prepayment of postage, by means of stamps of governmental issue was made obligatory by law, effective January 1, 1856. |
 | | Subsequent contracts for postage stamps continued to be awarded to private manufacturers until July 1, 1894, on which date the printing of stamps was transferred to the Bureau of Engraving and Printing, Treasury Department, where all postage stamps have since been produced, with the exception of those few issues specifically noted. |
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