I received these on Saturday, from Russia by way of Italy! None have any embossing, though the one on the right side appears to have a blot-out, in the same area that some Neman (HEMAH) insulators would be embossed, on the side of the dome. The darkest one may be a CD 568.3, I'll have to verify that. I do not know the CD numbers, if any are assigned, for the other three. All are in VNM condition, which is unusual for most insularots from the Former Soviet Union, as most have had long years of hard service in severe weather conditions.