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  • This marking was intended to assist operators of perforating equipment. 6: air mail overprint on SCADTA air mail issues of Colombia, indicating a consular overprint sold in Germany, 1920. 7: Scott Catalogue prefixes for forerunners, such as India, used abroad. 8: watermark, with Imperial Crown, used in Australian stamps, 1913-26. 9: Amic, papermaker initial as a watermark, in the one lira issue of
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