Here's a rarely seen U-1900 porcelain tramp from England. Stamped with Allied Porcelain Logo and the numbers 1 and 5 (separated by the logo). This insulator is shown on the NIA website but none are marked. Previously attributed to another manufacturer.

Measures 3" x 3". Has 1/4" thin sliver flake and teeny fleabite on base and 2 tic marks on middle outer rim. Easily VNM.

First email that says they will buy it gets it for only $175 plus 8.40 shipping. Thanks!