Hi! I'm Pablo from Santa Fe Argentina and i'm looking to finde some insulators from my city and region. They are all embosed ISOREX FCSF and with some number on it. 231 is the one i have only. Due to the economy of my country i'm not able to buy these insulators but happy to make a good trade for some Argentinian glasses. contact me if you are insterested. Thanks!

Photo is from Bob Berry personal collection.