Chelsea Clock Key Value Guide

This authentic brass wing-handle key is a vital accessory for the high-precision marine clocks produced by the Chelsea Clock Company of Massachusetts. Known for its signature 'butterfly' shape, this tool was specifically engineered to provide the high torque required to wind the heavy mainsprings of mid-century US Navy timepieces.

What Is Chelsea Clock Key Worth?

The typical price range for Chelsea Clock Key is $25 - $27 based on recent sales. However, values can vary depending on the item's condition, rarity, and other factors such as:

• The physical condition of the brass, including the presence of original patina versus heavy corrosion.
• The integrity of the winding socket, as rounded or stripped interiors significantly reduce utility and value.
• Historical provenance, particularly if the key is paired with a documented US Navy ship's bell clock.
• Current market demand for authentic replacement parts for Chelsea models manufactured between 1897 and the mid-1900s.

How to Identify Chelsea Clock Key?

• Look for the distinct 'butterfly' or wing-handle silhouette characteristic of Chelsea marine accessories.
• Verify the material is solid brass, consistent with 1940-1960 production standards for maritime use.
• Check for specific sizing that matches the winding arbors of Chelsea ship's bell clock movements.
• Examine the patina for signs of age consistent with a mid-20th-century American-made tool.

History of Chelsea Clock Key

Chelsea Clock Company was founded in 1897 in Chelsea, Massachusetts, and is renowned for creating high-precision marine clocks for the US Navy. The specific 'butterfly' or wing shape of this brass key is a signature accessory for their famous ship's bell clocks, designed to provide the necessary torque to wind the heavy mainsprings.