This is one that Pavel Yelkin had listed, a glass suspension "PS70E" which appears to be the same one as this one manufactured by Yuznouralsk: http://www.uik.ru/ru/3.pid_37.html

Update 02 DEC 2005: There apparently are two insulator plants with a very similar name, the marking of this insulator apepars to be exactly the same as the logo for the YuAIZ site: http://www.aiz.ru/

The English language site is here: http://eng.aiz.ru/

Pavel's original listing is here: http://cgi.eBay.com/huge-VINTAGE-INSULATOR-GLASS-RUSSIA-1990_W0QQitemZ6120534820QQcategoryZ795QQtcZphotoQQcmdZViewItem

[IFONA]