Here's a rare glass insulator from France that was made for the Santa Fe Railroad in Argentina. Embossed: ISOREX/FCSF (front) 234 (reverse). An insulator embossed ISOREX 234 was assigned 552.4 but it has a different profile than ones shown in the books or NIA website! This is not a cable top but instead has a round head! Measures 4 3/8" tall X 3 3/8" wide. Typical deep wire rub marks and a 3/16" peck (shown in photo).

First email gets this rare insulator. Don't snooze on this one!

P.S. Read March 1986 Crown Jewels article for interesting info on Isorex 234 embossed insulators in different cd than this one.