This is an "Anti-fog" profile glass suspension used in Eastern Europe. This particular unit is sold under the Global Insulator Group. This large company has glass manufacturing plants in Russia "Yuzhnouralsky Insulators" and Ukraine "Lviv." I cannot be absolutely sure, but this may be a Lviv product. The marking on the glass shell is as follows " ПСД 70Е" which translates to PSD 70E the model number.