This is hand sewn on a scarf. I have been able to find the trademark in the 1922-29 period, but I don't have the research resources to know it is only from that time period.
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thanks for providing the information.It does appear the name is the Scottish Woollen Trademark Association , rather than the Scottish Woollen Association.
Seems like their purpose was to set up a licensed trademark, a bit like the Woolmark, to certify true Scottish woollens from imitators. There's a few references to archives / libraries of various papers but nothing online..