The listing, Antique/ Vintage Pre or WW I Era RPPC Cavalry Encampment has ended.
Antique real photo postcard is postally unused. It has an AZO stamp box that dates this from 1907-18, so it is either from WW I or before, when they still guarded the plains. Great image, worth looking at carefully. The saddles laying in the foreground, the laundry hanging over the tents, pants hanging from a branch on the tree, bottle of wine (?) on the ground, and last but not least, the guy sitting on the right is pointing a gun at the cameraman! This wonderful old image is in near mint condition, too!