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Knowledge / Prints / Postage Stamp Overprints / Safety Measures |
Postage stamp overprint safety measure: safety measures that was carried out as a postage stamp overprint |
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Moir postage stamp overprint: postage stamp that has been printed with a wavy line postage stamp overprint to prevent forgeries |
Chalky postage stamp overprint: chalk or kaolin postage stamp overprint over the design print whereat the design print is partly destroyed during soaking |
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Security text stamp overprint: postage stamp with a text overprint using altered letters to prevent forgeries |
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