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PCLooks like a very faint "M P J" or "M P T" or "M R T" (?) on the jersey of the fourth player (fifth person) from the right.
Charelston is the capitol of West Virginia, and because the studio was located there, you can assume the team was (relatively) local. You might look for local schools that have been around for a while, with the letters M P or M R in the school name or the team name.
You might also contact the local Charleston newspaper or historical society, and send them an email or letter with that photo.