The Veteran World Cup (now the World Masters) was held in Spain in 1996. Here is an extract from an O-Net article I wrote in April 1996.
And to end with, a quote from Jorgen Martensson. It seems likely that he has managed the incredible double of being both World Champion and World Veteran Champion (H35) at the same time. Anyway, he was interviewed after he finished the first qualifying race, and asked if he had had any problems. He admitted that he had at first gone to the elite start. Then he remembered that he was running H35.