This old B&W photo of Murmansk shows quite a few insulators in use, my guess is that it is from the 1950s. Look closely, there is what appears to be a early 50s vintage Studebaker on the road.

The full sized original is located here:

http://my.teletoria.ru/gallery/Murmansk-old/3_0?full=1

The white porcelains are a lot more visible.

I stubmled across a rather interesting Russian Photo Gallery website here:

http://my.teletoria.ru/gallery/albums.php

Travel the world in a virtual way...