wow tom, is that the same style body that was use in the 1955 lemans race...
I don't know anything about the pic, it just popped up on my facebook w/no further explanation. I believe it's a 1955 MB W196 grand prix racer w/full "Monza" bodywork, sporting Juan Manuel Fangio's #18. They ran w/full bodies at the faster circuits, and as as open-wheelers at the twistier ones. Drivers included Fangio, Stirling Moss, Karl Kling and Hans Hermann. In 1976 I got to see Fangio drive his '55 championship-winning W196 in a vintage race that was part of the Long Beach F1 weekend. I know I've got photos around here somewhere...
The '55 LeMans cars were magnesium-bodied 300 SLRs that were based on the W196. The 300 SLR didn't look quite as swoopy as the GP racer. In '55, Stirling Moss and co-pilot Dennis Jenkinson won the Mille Milia 1,000 mile street race in Italy in a 300 SLR, finishing in 10 hrs, 7min, 48 sec (97.96 mph) which is still quite amazing. Here are pics of Fanio in action (note the spare goggles), and Moss & Jenks in Italy. MB pulled out of racing for quite awhile after the notorious '55 LeMans crash.