Circa: 1950 Manufacturer: Corning Glass Works/Made in USA
This clear glass insulator is marked: Pyrex T.M. / Reg.U.S.Pat.Off. / Made in USA / D.H.Pat. Appd. For. Although the Corning Glass Works has been in existence since 1868, the Pyrex patent was not issued until 1919, and the trademark was not granted until 1925. The plant still operates and is currently one of the leading manufacturers of fiber optic cables. In good + condition it measures 4 1/4 inches tall and 2 1/2 inches wide. Highly collectible I can think of no other use than a paperweight. An addition to any Vintage Insulator Collection. SH & Ins. will be quoted after orders placed. If you have questions contact me and thank you for looking.