N-TBD: United States (USA)
3 3/4" X 5 1/8" (95mm X 130mm)
(base around pinhole) THE GEAD POLE TOP #1 THE JOHN PRATT CO. / HARTFORD CONN PATD SEP "illigible"
Picture courtesy Nicholas Rose |
This is a feeder cable insulator made with cast iron over a composition base.