Gilbert Interval Timer Value Guide

The Gilbert Interval Timer is a quintessential piece of mid-century industrial design, manufactured by the William L. Gilbert Clock Company in Winsted, Connecticut. These 10-minute mechanical timers were vital precision instruments for darkroom photography development and medical X-ray exposure regulation during the 1940s and 1950s.

What Is Gilbert Interval Timer Worth?

The typical price range for Gilbert Interval Timer is $35 - $40 based on recent sales. However, values can vary depending on the item's condition, rarity, and other factors such as:

• Mechanical functionality and the clarity of the audible 'ding' at the end of the interval.
• The condition of the metal casing, specifically looking for original paint and lack of heavy oxidation.
• Clarity and legibility of the dial markings, which can be degraded by chemical exposure in darkroom environments.
• Completeness of the mounting flange and original setting knobs.

How to Identify Gilbert Interval Timer?

• Look for the 'William L. Gilbert Clock Company' branding or logo on the dial face.
• Verify the presence of the original metal casing and the integrated mounting flange used for industrial installation.
• Check for the specific 10-minute interval scale, which distinguishes it from standard kitchen timers.
• Confirm the construction materials include a steel body, brass internal movements, and a glass face cover.

History of Gilbert Interval Timer

Produced by the William L. Gilbert Clock Company, these timers were essential tools for mid-century professionals. They were commonly used in darkrooms for timing photographic development processes and in medical facilities for regulating X-ray exposure times. The company, founded in 1871 in Winsted, Connecticut, was one of the major American clockmakers known for durable industrial timekeeping equipment.