• A clear glass electrical insulator with a flared base and rounded side, lying on a light brown wooden surface.
  • A clear glass jar with a screw-on lid, lying on its side on a light-colored wooden surface.
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Vintage Armstrong Clear Glass Telegraph Insulator (CD 121)

$5.00 USD
$5.00 USD
Sale Sold out
Shipping calculated at checkout.
Vintage Armstrong Clear Glass Telegraph Insulator (CD 121)
Add a piece of rugged industrial American history to your collection with this Vintage Armstrong Clear Glass Insulator. Manufactured by the renowned Armstrong Cork Company (Glass Division) during the mid-20th century, this classic "toll" style insulator (commonly categorized by collectors as a CD 121) was originally designed to insulate telephone and telegraph communication lines across the country.
Molded from thick, heavy clear glass, it features the iconic double-groove petticoat design and prominent embossed "Armstrong" lettering wrapped around the lower skirt base. It is a fantastic artifact for industrial historians, glass collectors, or anyone seeking a unique rustic accent piece.
Creative Ways to Style & Repurpose
  • Industrial Desk Weight: Its heavy, thick glass profile makes it a stable, eye-catching paperweight for an office desk.
  • Upcycled Crafts: A highly popular raw material for DIY crafters building custom industrial pendant lights, garden borders, or table lamps.
  • Window Sill Accent: Place it in direct sunlight to watch the thick clear glass beautifully catch and refract the morning light.
Product Specifications
  • Brand: Armstrong (Embossed on lower base skirt)
  • Style: Toll Insulator / Communication Line Core (CD 121)
  • Material: Heavyweight clear molded glass
  • Dimensions: 3.75" Height
  • Design Features: Deep wire grooves, smooth top crown, and threaded inner cavity.
Condition & Vintage Notes
  • Glass Clarity: Clear and bright with excellent visibility and authentic vintage glass swirls.
  • Top Crown: Please note that this item has a visible chip out of the top glass rim. The price has been adjusted downward accordingly.
  • General Wear: As a true salvaged industrial artifact, expect minor signs of handling history, including light wire friction marks, internal bubbles, or tiny flea bites along the ridges.

Product Specifications

Dimensions

Height 3.75 in
Width 2.5 in
Length 2.5 in

Weight

Product Weight 1.5 lb
Shipping Weight 1.5 lb