Here's a rare U-1755 stamped with the Blue Scepter, trademark for KPM Konigliche Porzellan Manufaktur (Royal Porcelain Factory) Berlin. Company was founded in 1763 by Fredrick the Great of Prussia. This insulator was placed into production in 1858 and installed on Germany's Telegraph lines in 1870. A broken example of this insulator is on display at the Arts & Crafts Museum in Paris, France.

This example is in excellent condition and only has scattered light scratches and use marks and small rust spot in lower slot of crown. No chips or cracks! Measures 3 1/4" wide x 5 5/8" tall. First email gets this rare insualtor for only $375 postpaid. Thanks