Westclox Baby Ben Style 1 Hairspring Material Variations

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First a blued steel hairspring was used, then a copper color hairspring. The transition was ca. 1920 to 1922.

Hairspring Material Blued Steel:

Used from the beginning until ca. 1920 to 1922. Latest example seen: 3-1-20.

Starting ca. 1920 to 1922, the hairspring was copper color. Earliest example seen: 11-28-22.

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