The Legendary Cobb that you just posted a link to is I believe the one from 1941(and M114 should be correct)...Right around that time was when they started to drop the brown background and go to the natural photo's background.
The one the OP showed should be the one from 1910.
http://www.auctionscc.com/archive/20...ball-cards/22/
I know these have been designated separately as M113 and M114, but lately I've been seeing most of these considered M114's. I believe the SCD Standard Catalog has them all listed together without designation, which probably is contributing to the confusion. The Cobb you have should technically be a M113 though..