Authentication Mark. A tiny mark that appears on many older and rare stamps. It denotes that an expert has examined and approved the stamp's authenticity.
Authentication mark: Marking on back of stamps indication authentication of the stamp by experts.
B
Bank mixture: A high-quality lot of stamps.
Authentication Mark: A marking, such as initials, placed on the reverse of a stamp examined and certified to be genuine by an expert.
Marquilla: (Sp.) authentication mark put on the backs of stamps by Spanish dealers as evidence of its genuineness; also used as the name of the instrument making the mark.
 See also: Impression, Used, Watermark, Perforations, Applied
  
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