You are right, KC, there is something strange about that “mark”.
It appears to be a “J”, … then an “FTRU”, … then a “symbol” …. and then an “AC”.
Me thinks the "J" might be the "initial" of the artist since it is not in line with the other letters.
And with all capital letters it might be like an "EAPG" (early american etc.) or "U" for union or university, etc. .... just guessing.