Vintage Armstrong glass telephone line insulator embossed ARMSTRONG U.S.A. No. 23. These insulators were used on telephone and telegraph lines and feature the classic dome design with threaded interior for mounting on wooden utility pins.

Produced by Armstrong Cork Company of Lancaster, Pennsylvania, these insulators were widely used across North America during the mid-20th century.

A great collectible for insulator collectors, railroad and utility memorabilia enthusiasts, or vintage industrial décor.

Brand: Armstrong
Color: Clear / Light Aqua
Material: Glass
Type: Telephone Line Insulator
Production Style: Utility Glass
Shape: Dome
Product Line: Electrical Insulators
Country of Origin: United States
Production Technique: Molded Glass
Pattern: No. 23
Theme: Telephone / Telegraph
Vintage: Yes
Time Period Manufactured: 1930s–1950s
Finish: Gloss
Origin: Lancaster, Pennsylvania USA
Style: Industrial Utility

Features:
• Embossed ARMSTRONG U.S.A. marking
• Model No. 23
• Threaded interior mounting
• Classic dome utility design

Antique: No
Handmade: No

Height: 4 in
Diameter: approx. 3½ in
Weight: 1 lb 10 oz