Going back to the Eighties, a lot of rallies of all types, steam, vintage, etc, gave cast brass plaques and I know some people would not attend unless there was a plaque....and also kicked up if they had run out of them and did not get one. Those were the days when owners would proudly display their "Where we've been" board in front of the vehicle, first job at show, to fix the latest plaque on it. Not seen half so much now. I think it died out because the public took more interest in looking at the boards and not the vehicle it was leaning against.