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The watermark - as an inseparable element of antique paper and first form of proto-industrial logo - by virtue of its own meta-data repertoire regarding paper support since the 20th century, plays a fundamental role in heuristic investigation, imposing watermark studies among the auxiliary disciplines of history. Their study offered important information about the place and date of the production of a paper document with a low margin of error. This has led to an increasing use in the art history sector, in particu...