For a very brief period, Kerr made insulators after buying out Armstrong, and simply added the embossing of "KPP" (Kerr Packaging Products) in an oval. By 1972, the molds were retooled to read "Kerr". This insulator is not even known to exist, according to the 1999 book. Not sure if it is even listed today. Not old, not too colorful, but a rare insulator all the same. Condition is close to flawless. $25, post paid in the US.