U-179 PORCELAIN incuse hand stamped P R R SCARCE 2 minor chips / flakes to the inside skirt. Incuse stamped on the dome P R R (see second photo) this insulator was made by Pittsburg High Voltage Co. This style of insulator is becoming very hard to acquire. $45.00 plus actual postage will bring this to your collection (Insurance is optional/extra). Buy with confidence! We do not sell altered insulators. Don't wait for a sale it's not going to happen. Pay-Pal is always welcome as well as money orders and Personal checks.