I am trying to ID this Victor multipart porcelain insulator. It looks like a mini version of a large porcelain multipart insulator. The base is 6" in diameter. Top is 7 1/4" in diameter. It's 5 1/2 inches high. The top is marked with the mini version of Victor insulator (before 1928) The main difference between this insulator and others is the bond area between the two pieces. Any help is appreciated.