From first glance it looks good but hard to say from a scan. I think stamped backs are just difficult to authenticate. I would want to fondle
and put the card under a loupe for more accurate analysis. I would really feel the paper and make sure it feels like 95 yrs old paper.
ps...If it is in hand and sans holder I would go ahead and put it under a black light. It doesn't always help but can't hurt and at least that check mark can be done if it passes.