That may be a high if they kept the same design from the '65's. My 65's were: CCW curl was hi, CC curl was lo if that helps anyone or can be confirmed. Mine were Sparton brand. Mine denoted tone right next to the bell, LO or HI.
Tracy, the horn is stamped hi on the main body of the horn just below the mounting bracket. If you look closr you can see it at appx. 12 oclock in the picture. thanks