Vintage Art Nouveau photograph cover, 1904 by Robert Barone

<br /><i>Via Flickr:</i>
<br />Semi-clear cellophane  protective cover for photographs. So far this is the only example I have of a printed, protective flap on a photograph. I assume they were common but were easily torn-off and lost. I even have a precise date, 1904. I think this photograph (see comments) has always been carefully conserved.