Model 49-503, circa 1949.  Philco produced the Flying Wedge along with the "Boomerang" a few years before the words "Eames" and "Googie" became buzzwards.  A killer design, where curves and lines co-exist nicely.  This is the teal plastic version, which shows up in a few slightly different shades.  Other colors were brown, maroon and black.  I like my radios to have the original backs, especially on the 40's & 50's sets, but this model is very elusive when it comes to them.