RARE Antique Tregoning Porcelain Screw In Electric Plug & Perkins Mate Socket
Tregoning plug appears to have a mold mark on one edge (has glaze except center of mold breakaway). 660 W 250 V Tregoning Plug, Perkins Socket June 13,1899 Patent, 250 V, 50 C. Rare screw in plug as found with quick connect Perkins Socket (not a light socket).