On the back, I see the letters “??AF I?c” and believe it might perhaps read “CSAF Inc”. If so (and accepting that the cross might be only a few tens of years old) I wonder if it might be from the “Christian Schools Athletic Fellowship Inc.”
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CSAF Inc was founded in 1980 by a small group of schools in the Dallas and Fort Worth areas of Texas with the primary purpose of developing “Christ-like character through quality athletic programs, with attention given to fellowship, respect for opponents, playing heartily as unto the Lord, and Christian fun.”