Original Vintage Double End American Clock Key-3.5mm x 3.5mm, No.5

Vintage Double End American Clock Key 3.5Mm – Original Vintage Winding Key

This original vintage double end American clock key 3.5mm is a genuine older winding key for a compatible mechanical clock. The square opening measures 3.5mm x 3.5mm main end and is listed as No.5. The small end is approx. 1.75mm x 1.75mm, listed as No.000.

Original period keys are useful in sympathetic antique-clock restoration because they retain more of the character of the clock than a modern generic replacement. They are also useful when completing a clock that has lost its original winding key.

The most important compatibility check is the internal square opening. A correctly sized key should fit the winding arbor securely without excessive play. A loose key may slip and round the arbor corners, while an undersized key should never be forced.

Product Details

• Brand / marking: American
• Square opening: 3.5mm x 3.5mm main end
• Listed key size: No.5
• Overall dimensions: approx. 50mm x 50mm
• Material: Brass
• Condition: Original vintage / used
• Quantity: 1 key

Important

Measure the winding arbor accurately before ordering. Key-number systems can vary, so the millimetre measurement of the internal square opening should be used as the primary compatibility check.

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