Also from the C.M. Wimmer studio in Perkasie there's a chance this is a pre-NFL Frankford Yellow Jackets which played in the outskirts of Philly from 1899 until they joined the NFL in 1924, but I can't make any positive identification. The cabinet is obviously missing the lower left corner. There is staining and some pencil on the reverse. The photo isn't bad, there is some staining and toning.