Here's a RARE Dark Olive Green Isorex 32 embossed tunnel insulatort! This unusual style insulator has been seen in porcelain used in tunnels in Italy and Switzerland. But this is only the second one known in glass! I am not aware of any others out in the wild or in collections. Excellent condition with only 3 tiny tic marks and two tiny flakes (no cracks)! This photo borrowed from previous sale. Color and description is accurate.

This beauty remains unlisted in the books and the NIA website! Measures 2 1/2" x 3".

First email gets this RARE spool insulator for only $525 shipped. Thanks!