Original 1943 electrical trade vintage ad for IRVINGTON VARNISH & INSULATOR COMPANY.  Main office and plant was located in Irvington, NJ.

Manufacturers of Insulation.  

Double Insulation Protection with Irv-O-Volt.

Irv-O-Volt is constructed to withstand hard use and have long life under motor temperatures. That's why Rubicon Company of Philadelphia, PA uses it to insulate wires passing between this motor housing and chassis casting. Because it is varnished inside as well as out, Irv-O-Volt tubing gives double insulation protection. 

Unbound from a 1943 electrical engineering magazine, this unique old one-page advertisement would display beautifully matted and framed. Nice graphics. World War 2 propaganda. A fabulous addition to your retro electrical library.