Bizarre. You might have some interesting collectible photographica on your hands.
I vaguely remember that there was a 72 exposure reel and tank during that brief period in the heyday of the high speed motor drive, when Ilford was selling HP5 on a thin base in 72-exposure rolls. It never really caught on. Maybe it was the special reels. Maybe it was that the thin film base didn't stand up to the motor drive.