![RARE Antique Tregoning Porcelain Screw In Electric Plug & Perkins Mate Socket RARE Antique Tregoning Porcelain Screw In Electric Plug & Perkins Mate Socket](https://antiqueelectricfan.info/wp-content/image/RARE-Antique-Tregoning-Porcelain-Screw-In-Electric-Plug-Perkins-Mate-Socket-01-vaky.jpg)
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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).
![RARE Antique Tregoning Porcelain Screw In Electric Plug & Perkins Mate Socket RARE Antique Tregoning Porcelain Screw In Electric Plug & Perkins Mate Socket](https://antiqueelectricfan.info/wp-content/image/xofyjuqam.gif)