UPDATE: This post originally featured the press photo at the bottom. Adding to the information, I discovered an article from the May 1956 issue of Willys News discussing how the buffalo were more patiently herded by jeeps than by horses.
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According to this 1951 press release, this jeep was used to round up twelve buffalo. They were shipped to Chicago for an international livestock exhibition. The watermark kind of obscures the jeep.
“You are bidding on an original press photo of Jeep Beside Buffalo in Custer State Park South Dakota. Photo has newspaper marks & waving right edge Photo measures 7 x 9 inches and is dated 11/27/1951.”