邮票画面上方为唐代高鼻钮“中书省之印”,铜铸,为唐代中央官署官印,现藏于故宫博物院。此枚印章的制造采用当时较新的造印方法,即用铜条叠成文字后再与印面凹槽焊成整体,其成印字口较深,印蜕有铁线阳文之感,为当今较为少见的唐代官印。
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