Here's a rarely seen radio strain embossed: "PYREX - INDUSTRIA ARGENTINA CR" (that's a lot of embossing for such a small insulator!) I can confirm thru my research that this insulator was made as a joint venture production between Pyrex and CR= Cristalerias Rigolleau! 3 1/2" long from end to end.

Has tiny rough spots and tiny rub marks in the eyelets otherwise excellent condition! These are hard to find. First email gets it for only $100 plus shipping. Price is firm. Thanks!