This Gem Pan does not fit any of the Griswold variations in Haussler.  However, it is exactly the same size and does say "6".  I noticed that different manufacturers used different model numbers for identical looking pans.  So the 6 in and of itself is interesting to me.  The casting and finish is also very good.  Finally, it has gate marks -- none of the Griswold's do.  
So my question is, is this a new variation or a pan made by a different manufacturer, and if so, any ideas?