Here's an unlisted porcelain cordeaux made in England by Bullers. Crown incuse embossing LGSM. These markings are nearly always the name of a railroad, in the case a railroad in Argentina- which remains unknown at this time. Dome is marked with the Bullers logo and 1952.

Excellent condition with no chips or cracks with only 3 tiny spots where the glaze did not adhere to the porcelain at the factory.

First email gets this scarce insulator for only $50 shipped U.S. Thanks!