Hi,
You could post this on the main forum for more responses.
Some E95 cards like yours come from a notebook and do sometimes have blank backs. Other hand cut E95s have been found with partial advertisement backs. I'm not sure if yours is authentic. It looks a bit artificially rounded/aged. Color looks off to me as well. I could be wrong though. You don't see these every day.
Here are a couple of old threads that may be relevant. There are probably more over the years if you use the search function.
http://www.net54baseball.com/showthread.php?t=195864
http://www.net54baseball.com/showthr...t=e95+hand+cut
Best of luck with it.
Rob