The 1E3 paper is difficult to type because, as previously mentioned here, and thanks to the work of Rein, a member of the Australian Stampboards Forum; there are three types of 1E3 papers. For some of the 'cents' values, the color change is enough evidence to know that the paper is 1E3.
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The 15c Small Format Cattle changed to a lighter blue in 1939.
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The 20c Martin Guemes changed to a darker blue in 1939.