This is a relatively scarce item, a late 19th century device designed to stop one's watch being stolen, or picked, from one's pocket. This small brass-colored metal acorn has three concealed prongs thfrom
Antique Pocket Watch Chain Anti-Theft Device - Acorn Spikes
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Watch Fob Acorn
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Special 19th century pocket watch - Sweep second, hacking and Emery escapement
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Watch Fob Acorn