Porsche 917 in light blue enamel.  I won this via auction in 1997.  The car has some paint wear, but displays extremely well.  This casting is one of the hardest to find from 1973 (although they are ALL hard to find).  Ironically, while ice blue is a harder color to find in the Spectraflame years, light blue seems to be one of the common colors in 1973.  Seven of the cars I have from that year are painted in this color.