Summary
Birch's key, cylindrical, fluted. Adjustable to fit different sized winding arbors.
Physical Description
PATENTED BY JOHN S. BIRCH. U. S. PATENTS 13:4:1869, 23:5:1876. MOSTLY USED BY WATCHMAKERS. KEY MADE BY MANY MAKERS WHEN PATENTS EXPIRED AND MOSTLY OF INFERIOR METAL. THIS IS EVIDENTLY ONE OF THE LATER EXAMPLES.
More Information
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Collecting Areas
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Acquisition Information
Donation from Mr John Askew, 26 Nov 1929
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Classification
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Type of item
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Overall Dimensions
4.6 cm (Length)
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