I've been accumulating some Russian glass insulators during the past several months. I am not sure of the CDs of these four. The two in the center have very thick skirts, the 2nd (green) is weakly embossed B C 3 (Cyrillic V S 3) and has a small "bulls eye" incused on the crown. The other three are unembossed.

изоляторы poccии

[IFONA CD 568.x ???]