Card Mounted Photo - Most Likely Post Mortem
This is a card mounted photo purchased at an antique store. This is most likely a post mortem photo.
In addition to the Carte-de-Visite, Cabinet Card, and Stereotype, which are described individually, there were a variety of other card mounted photos, in more-or-less standardized sizes, some of the most common being called Victoria, Imperial, Prominade, Panel, and Boudoir. Panoramic photos were also often card mounted, though the size was not standardized. None of these other sizes are as common as the CDV, Cabinet Card and Stereotype. (source: www.ajmorris.com/roots/photo/types.php)