most of us have seen the easy reprint with the very large gap between the thin line and image. This one in this auction is a new one to me, I dont think Ive seen the SN back with a small gap, yet the foot is slightly cropped too. the back has that slight blue tone and gives it away too, beside the foot and that little gap in line in corner...
the fake that fools some people is like this (link below), its almost perfect on front, it has the right gap and also that small gap in corner and shows the right amount of foot. its a blank back card (wrong card stock), the place I look is the caption is too bold, especially the number. On authentic cards the number is slight lighter than the name, and the caption print is crisp and not so bold.
http://www.ebay.com/itm/1915-BABE-RU...item1c1d8ee733
authentic card
REA auction card