is that FG for "fiberglass"?
I found this pic from 77.
Thanks Benson..The cover of the 1977 catalog that you attached actually shows a 15 foot long Chipewyan model made out of Oltonar or acrylonitrille butadiene styrene (ABS) plastic as described on the top of page three and pages six to nine in that catalog if anyone is really concerned about details like this.
Benson