Here's a CD 677 ISOREX (front) 244 (reverse) dark olive green t-bar glass insulator from France. Appears to be embossed over earlier embossing: I can see a large "U" or possibly an "L" beside/underneath the "x" of ISOREX. Other letters are less distinguishable but do show as anomalies around the other letters. This feature is not listed in the books or NIA website.

Has tiny chip and some light roughness on the top of the crown and arms that looks like tiny tic marks. Some roughness in the pinhole threading and teeny base flake (smaller than match head).

First email gets this unreported T-Bar embossing from France for only $100 plus $10 shipping. Thanks!