If anyone finds birth/death dates I can add them to the Find-a-Grave site. Note: the cemetery administrator does not have those dates.
Interestingly I found him on a 1900 census record giving a birth date of Mar 1878 which would make him solely a Span. Am. war vet only. The stone sure looks like what is used for Civil War vets, though. I guess similar stones were used for both. https://familysearch.org/ark:/61903/1:1:M31X-PSQ