The serial number on a Harris Tweed jacket label was once used as an internal tracking device within the Harris Tweed industry. The label was applied to a product or garment after it was made by its manufacturer, tailor or designer. The Harris Tweed Authority is not able to provide historic or provenance details on individual garments - to find out more about the age or provenance of your jacket, it may be worth contacting the manufacturer or tailor. You can always be assured, however, that the Harris Tweed fabric itself was handwoven by a weaver in the Outer Hebrides of Scotland.