Here's a CD 435 embossed: ISOREX 1099 (front) CGBA 1936 (reverse) AND sandblasted: 1936 on the side of the skirt! I've only seen a couple with the duplicate date added. These were made in France for the railroad in Buenos Aires, Argentina most likely in the year 1936.

2 tiny tic marks and 1 small ping, otherwise Mint condition! First email gets this historic railroad insulator for only $75 plus $10 shipping. Thanks!