We found this vintage ad for the excellent Daf 44, from the Dutch company that pioneered rubber band drive, now called the very-boring CVT. These things were as fast backward as they were forward, leading to the greatest races of hoonage we have ever seen.
Still, we have no clue what the hats are about. They're probably getting ready for some achteruitrijden, but we can't be sure.
(Hat tip to phenotyp!)