The EFDA Nations Cup, was a Country vs Country competition for Formula Opel cars between 1990 and 1998. It had always been Dan Partel's dream to stage a race that pitted drivers in equal cars racing for their country. The Formula Opel/Vauxhall one make racing series offered the best opportunity for such an event.
The 1993 EFDA Nations Cup (Nations Cup IV), was held at Estoril, Portugal (3 October 1993).
References
1993 EFDA Nations Cup Wikipedia(Text) CC BY-SA