Limited Edition 50 years Celebration Pack - Mercedes. The fantastic Mercedes SLR car also shares its 50th anniversary with Scalextric. Therefore, we have produced the famous Moss - 'Jenks' Mercedes 300 SLR from 1955 along with its modern day super car version of the 300 SLR. This particular modern version of the 300 SLR is a special build produced by Mercedes in their celebration of this famous marque.