Here's an early porcelain unipart insulator found in Brazil but most likely made in Germany. Incuse marked with "F" on crown. Measures 4" w x 4 5.8" tall with a 7/8" pinhole. VVNMint condition with light inner skirt stains and teeny outer base flake. Circa 1920-35.

First email gets this cool unlisted porcelain insulator for the reduced price of only $100 plus shipping. Thanks!