NOS 1928 1929 1930 1931 Model A Ford EDISON Spark Plugs 39T Set #1  These plugs are NOS however they have been in moisture at some point.  The tops of the plugs have rust but it can be cleaned off using steel wool,etc.  the firing points of the plugs are not rusty as you can see from the pictures.  The boxes show the moisture damage.  These plugs are more rare than the 3X Champion plug and run better from what I am told.  As of this listing, I have 3 sets.