This appears to be based on the Pass & Seymour patent but is unmarked (see below). 2 1/2" long and can be dated to 1897 where it was used at a tight curve along a St. Ry. With one side of the grade here bedrock and the other a steep 100 ft. drop to a river below, they decided to anchor into a stout oak tree 22 ft. up. The tree hugs the drop off. You don't want to know how I retrieved the piece.

There appears to be blackening from electric currents which an acid bath should make quick work of. Chemical baths can be not so gentle on this early type porcelain though, so I will leave as is along with the tie wires.

A write-up on these by Elton Gish can be read in the December 2015 issue of CJOW.

I stand corrected. There is a marking on the end, appears to say PATD"? Very tough to make out. No writing in the groove.