Pin with photograph of McClellan

Pin with photograph of McClellan
Title
Pin with photograph of McClellan
Medium 
Metal, tin-type photograph?
Dimensions 
Overall: 1 x 3/4 in. ( 2.5 x 1.9 cm )
Description 
Rectangular pin back button; tin-type photograph of General George B. McClellan in uniform in gold metal frame
Object Number 
Z.2586[dup]
Due to ongoing research, information about this object is subject to change.
Creative: Tronvig Group