Here's a pair of RARE U-1578 side knob porcelain insulators from England. They are featured on the cover of Worldwide Porcelain Insulators Book. These are quite early insulators (circa 1900-15), evidenced by the "nose" which is glaze welded in place! Hard to find marked examples other than GPO.

On the left is a dome incuse marked Taylor Tunnicliffe & Co. Ltd. (from the UK). Also marked GPO with military arrow. Here's a pic: [id=600915418] Has a match head glaze rough spot on the nose, small scratch on the dome and light use marks on the reverse skirt and wire groove. Steam train smoke in pinhole. 2 1/2" wide x 4 1/16" tall. Easy VNM. No chips or cracks!

Rarely offered! First email gets it for the slashed price of only $200 shipped!