Porcelain insulator measures 2 3/4" tall x 1 3/4" wide. Stamped 1 (in triangle) GL 4192 with what looks like Hermsdorf tridelta mark. Original copper and brass cable attachment soldered onto unknown pin. Found in Italy. No chips or cracks with small area of stains on smaller knob.

First email gets this unusual insulator for only $35 plus shipping. Thanks