Guide Dot - a dot placed upon an engraved plate as a guide to the siderographer in properly placing subjects upon the plate.
Guide Dots or Lines
When a printing plate is created, markings to aid perforating and trimming are added. In most cases, these markings are trimmed off, but some finished stamps show these lines and dots. U.S.
Guide dots - faint markings used to facilitate the correct spacing and laying down of the impressions on the plate ...
Guide Dots. Small dots made on the plate or transfer roll as a guide in the correct spacing and alignment of stamps.
Guide Line. Lines appearing on sheets of stamps (and coils) intended as a guide in perforating.
Guide dot/line - Dot or line appearing on a postage stamp as a result of failure to erase punched or inscribed marks on the plate intended to guide the platemaker in entering the stamp impressions.
Guide dots: dots placed on stamp plates to help in the alignment of rows of stamps.
 See also: Sheet, Pair, Grill, Error, Used
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