I recently won this cool mounted photo at auction, allegedly circa 1900,  and may keep it as is--or might want SGC to put it in a holder, without caring what grade it might get, even just Authentic.  However, would they even do that? It's mounted (and 4 1/4  x  6 3/4) but has no studio ID at all and no trim or border design.  Does it even qualify as a cabinet card?  
Maybe this is a question others have had also. Thanks.
http://www.net54baseball.com/attachm...1&d=1421884739