Hey there MM,
The link i usually provide for the 52's RC...also has a link to detect a 51 Bowman
Here the link:
http://home.comcast.net/~52mantle/52toppsmantle51b.htm
I cant see much without a larger view, but i do see the corner tips being black.
Like the link says, the facial feature is important to see...look natural in color---not sunburned.