This link shows the distinct slats in the yellow background, which is a wall or building:
http://cgi.ebay.com/1952-Topps-Baseb...#ht_500wt_1287
The alternate is a murkier background with no slats showing but is a lot harder for find from what I have seen. This may show both:
http://www.google.com/imgres?q=1952+...w=1366&bih=681
I recall some really blurry ones but don't have any.