The season finale at Riverside, the final race of the Trans Am 2.5 Challenge, had no trophies. The winner was given an old fishing hat by SCCA Race Steward Joe Henderson

The season finale at Riverside turned out to be the final race of the Trans Am 2.5 Challenge.

Morton wins Riverside, with Peter Gregg 2nd

For winning a Riverside, John Morton was awarded an old fishing hat by SCCA Race Steward Joe Henderson. It seems that the SCCA, with their fantastic organizational skills, forgot to have trophies made for the race.
The SCCA's Executive Director would not even approach the winners podium.

In fact things were so bad the O-2 series ended early for lack of interest. The 2.5 Challenge continued alone

“There is no race queen, no trophy, no celebration at Riverside,” wrote Wilkinson. “In the embarrassing scene in the winner’s circle, Joe Henderson, the SCCA series steward, presents John his old fishing hat because no one has provided a trophy.”

http://www.datsunhistory.com/transam1.html
https://www.carnichiwa.com/racing/vintage-datsun-racing-revisited-the-stainless-steel-carrot-chronicles-the-early-years/