Check the listing for details. TRUMBULL Electric Co Copper Double Knife Switch on Porcelain Base Frankenstein. Listed at 19.99 USD. This auction is for a Vintage Antique Frankenstein Type MARKED Trumbull Electric Co Copper DOUBLE Knife Switch on a Porcelain Base. The porcelain base measures 3-5/8” long by 2” wide and It is in very good condition as shown in the photos. It appears to be in complete proper working condition but I am not an expert. Buyers in the United States pay $7.99 shipping, insurance and delivery confirmation by USPS Ground Advantage. Thanks for looking!!!