This insulator I gave my friend the electrician. He said that he found his half-buried in the ground near the industrial building, where they were working. According to him, such isolators are very rare in my country.
Embossing 69 and then a triangle on the stem in a circle, then the figure 14. Below KOREA.
If the first digit is the year of production, and "KOREA" is a country, it is unlikely that the insulator from South Korea, because at that time, South and North Korea were in conflict, and the Soviet Union supported North Korea.
I hope that among iconers are collectors who can confirm or disprove my assumptions.
I would be grateful for the assistance.