How about a long-shot? Can this be part of an old temporary type grave tag. I seem to remember such things that were either temporary or sometime was all someone got. Seems like they were put on by organizations.
T. Edward Wilson died in 1889. Company H, Third Regiment Confederate cavalry. Pensioned in Pulaski County, AR., pension app number 29119. (Middle of the state, while Alpena Pass was on the northern border.) Widow Adele Stuart Wilson applied for benefits in 1927. Alpena Pass was founded on an old graveyard. References say the town was founded in 1908, but I find records of people born at Alpena Pass earlier than that. And a reference to drought at Alpena Pass in 1901. And someone married at Alpena Pass, AR in 1893. And a photograph of a man made at Alpena Pass, AR in 1870. And someone who died there in 1839. So, it's entirely possible Wilson was living there when he died.