This insulator has the following writing on the sides: PYREX T. M. REG. U. S. PAT. OFF. MADE IN USA 63. (letter G over USA).There are few tiny black smudges from wires. Otherwise it looks beautiful. Nice color.There are about a dozen short lines inside the glass on the inside of the insulator (see pics). they are not visible from the outside. I tried to capture it on camera.capture on camera. THANK YOU for looking. I will insure this package myself. your total shipping cost is $6.00 Check out my other items !Be sure to add me to your favorites list ! I will be listing more insulators in near future. I gladly combine shipping for two or more items,feel free to request an invoice with an adjusted shipping price.Our international buyers can request a quote for First Class mail rates.If you win the auction - I will send you invoice upon request.If I can save you money on shipping - I will.