"Daguerreotype "
photographic process developed by Nicéphore Nièpce and Louis Daguerre, which produces an image without a negative on a silver plate? this portrait represents a young woman of quality from the Napoleon3 era in an embossed leather case. slight alterations on the process. its weight is 136 grs 
Le Magazine de PROANTIC
TRÉSORS Magazine
Rivista Artiquariato