Vintage clear glass insulators. In great condition, normal wear due to age, a couple dings to glass.
Set of 3: Large one is marked Armstrong's DPI Made In U.S.A. 36 52...
Middle size is marked Hemingray- 16 Made in U.S.A. 21 -9
Smaller one is marked Whitall Tatum36 No 9 Made in U.S.A. 41