All that's left of a solid poured CD 126.4 W. U. insulator. The mold letter "C" can be seen at the bottom and the W.U. letters are clearly embossed. The back is sheared off where the 1871 date would have appeared. It must have been dumped out of the mold and allowed to slump until it cooled enough to go solid. Perhaps it was a mold warmer?