Side-By-Side bilingual book: English - Italian, with double parallel text, English and Italian. Abstract: brief account about the origins of photography; daguerreotype manufacturing and historical daguerreotype process; recognition, identification and classification of hallmarks on daguerreotype plates; tables with images and reference codes for cataloging hallmarks. Hallmarks impressed on daguerreotype plates can provide precious information on the area of ​​origin, on the producer, on the eventual importer and sometimes also on the photographic studio and the date of production. Most daguerreotypes have long been considered anonymous. The hallmarks impressed on the plates tell a different story and open the way to consider signed daguerreotypes by known makers.