Unless I am mistaken, I have actually seen this SSK at Salzburg Classic Days back in 2005. The back ground, the large tent, are very reminiscent of the set-up at the Salzburgring.
One other car that also looks familiar is the Open Tourer as depicted in Des' pictures. What a magnificent car. There was talk or hint that its value approached five million Euros - or maybe that was the 300SLR that competed (and I think won) the Panamericana Rallye back when. It can all get vet confusing. I shouls put in some pics, but it's still pretty early in the morning. Regards Styria