The really "Old School" boating thread

[gn7]

Jerry, do you know what year this was? I am guessing 1969 based on the dates, fri, sat and sunday, and there is still a SK and ERR class. The Jet classes kind of throws me though.
The next years with fri sat and sun falling on the dates is '75 and 80.
I noticed there is no GN, KM class. In 1969 they didn't race APBA. They were running the "Professional" drivers association or what ever it was called.

EDIT: figured out it was 1975.