One of the mysteries of the English language finally explained.
Originally and chiefly US. A chain or strap attached to a watch for carrying in a waistcoat or waistband pocket, often worn hanging outside the pocket; (later also) a small decorative fob or functional object attached to such a chain or strap.
Late 18th century (in an earlier sense). From watch + fob.
watch fob/ˈwɒtʃ ˌfɒb/
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