You can search high and low and never find an Electrose-marked insulator, other than the common radio strains or maybe a beehive style. Every other style found in Electrose catalogs seems to have disappeared from the planet. Some think the Electrose insulators were just not as sturdy as glass and porcelain insulators and eventually decomposed.
These were found in a museum sale of a larger-size porcelain insulator collection. Offer in trade for California insulators that will fit into my collection [id=549405707]