About 6 months ago, some of my relatives were visiting their hometown in Poland. Somewhere in the process of getting there, vacationing a bit, and then heading home, they came across 3 Polish insulators. I was incredibly surprised and pleased to receive 2 of these when they returned home! (the third broke while making the trip in their baggage). The piece on the left is a white porcelain piece with two wire grooves, and is stamped "C2003" and under that, "N80/2" on the dome. It can be assumed that "2003" is the date of manufacture, so it is not terribly old. The piece on the right, however, is a different story! I'm intrigued! It's probably not old, but it is a beautiful and small thing of beautiful clear glass, and it came from the country of my ethnicity!
The embossing runs around the crown of the insulator, and it reads, to the best of my Polish interpreting abilities: "CENA 210 IŁ Ns 80" The "A" in "CENA", however, is upside down for some reason. The insulator is a beautiful sage green colour, and is 3" tall, by 3 1/8" wide.
Mr Edward Brown has helped me to conclude that the insulator on the right is a CD 472. The "80" embossing on the crown is a measurement for the diameter of the skirt in millimetres, and the piece probably dates from the 1930s to the 1970s