plate mark

noun

1. hallmark.
2. a mark made on paper by the edge of an intaglio plate during printing.

Word History and Origins

Origin of plate mark¹

First recorded in 1855–60

Example Sentences

The lines shown on the plate mark the grooves which cross the shell, and are slightly darker in shade than the ridges.

From Project Gutenberg

The smartest, at present, is that with a raised margin—or plate mark.

From Project Gutenberg