Whitall Tatum No. 1 Glass Insulator Value Guide

The Whitall Tatum No. 1 is a classic American glass insulator produced in Millville, New Jersey, between 1900 and 1930. These squat-style insulators are highly prized by collectors when they exhibit a deep amethyst hue, a result of manganese in the glass reacting to decades of solar ultraviolet exposure.

What Is Whitall Tatum No. 1 Glass Insulator Worth?

The typical price range for Whitall Tatum No. 1 Glass Insulator is $80 - $150 based on recent sales. However, values can vary depending on the item's condition, rarity, and other factors such as:

• Intensity of the purple color, with deeper 'black-purple' shades commanding higher prices than light lavender.
• Overall glass clarity and the absence of 'snow' or internal bruising from years of outdoor exposure.
• Physical condition, specifically the lack of chips on the inner or outer skirts and the integrity of the threads.
• Presence of original manufacturing bubbles or unique glass swirls that add character to the specific piece.

How to Identify Whitall Tatum No. 1 Glass Insulator?

• Look for the 'WHITALL TATUM CO.' and 'No. 1' embossed lettering on the glass skirt.
• Verify the distinct amethyst or purple color, which indicates the presence of manganese used as a decolorizer during the early 20th century.
• Check for the specific squat profile characteristic of the early No. 1 design compared to taller, later models.
• Examine the base for a smooth or drip-point finish consistent with Whitall Tatum manufacturing techniques of the era.

History of Whitall Tatum No. 1 Glass Insulator

Glass insulators were produced in the late 19th and early 20th centuries to support and insulate telegraph, telephone, and power lines. Whitall Tatum was a prominent American glassmaker based in Millville, New Jersey, active from the mid-1800s into the early 1900s. Their No. 1 style insulator is an early, squat design; when exposed to sunlight over decades the glass often turns purple due to manganese used as a decolorizer reacting to ultraviolet light, making amethyst examples especially collectible.