Norwegian U-1431 together with a rare original cast iron base that was mounted on the top of the poles, as in the photo. Stamped 1924 and NTP (Norwegian Technical Porcelain) from the factory in Fredrikstad founded in 1916. The height including the base is 19 cm and the diameter of the cast iron base is 11.5 cm. The insulator has no damage or cracks, for sale for USD 110 including shipping from Norway. PayPal preferred, more photos upon request.