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暗记是邮票设计师、雕刻师或制版者在邮票图案中特意暗藏的标记。它是集邮者鉴定邮票真伪,区分不同版别、版次的重要依据。暗记的种类如按照邮票暗记的制作者划分:有邮票设计者暗记、雕刻者暗记、印刷厂家(制版者、印制者)暗记;按照邮票暗记在印版上的表现特征划分:有母模暗记、子模暗记、版次暗记、版暗记;按照邮票暗记的构成特征划分:有文字暗记、字母暗记、数字暗记、线条暗记、网点暗记、字距暗记、笔画
The secret mark is a stamp that is deliberately hidden by a stamp designer, engraver, or plate maker. It is an important basis for stamp collectors to verify the authenticity of stamps and distinguish between different editions and editions. According to the type of secret stamp stamp makers divided: there are stamp designer stamp, engravers secret, printing manufacturers (plate makers, printers) secretly; in accordance with the stamp secretly marked on the plate on the performance characteristics of the division: , Sub-model dark, version of the dark mind, version of the dark mind; in accordance with the composition of the stamp secret characteristics of the division: a text secret, alphanumeric, digital secret, dark lines, network secret, karmic, strokes