The Harris Tweed Orb became the official copyright by the Harris Tweed Associaiton in 1909 becoming law with an act of Parliment in 1993 with a change in name to the Harris Tweed Authority. All cloth certified as Harris Tweed since 1910 has the orb stamped on the material and has a label containing the orb.
Anything else may indeeed be handwoven in the Outer Hebrides, or in the slums of Mumbai, or from any wool at all by any means, as it is not authentic certified Harris Tweed. Therefore without the orb let the buyer beware.
All orb certified Harris Tweed must be produced from wool from Scotland (only from the Outer Hebrides prior to 1934), since 1934 the Wool and yarn can be produced on the mainland of Scotland from Scottish wool, but must be transported to and hand woven in the homes of said Outer Hebrides residents. No power looms allowed.
Estimates are that 50% of Harris Tweed wool and yarn originates from the mainland since 1934 to keep up with demand and prevent prices from becoming uncompetatively high, destroying the industry. And all those sheep (or is it their wool? Must be virgins

). But it is all hand loomed at home in the Outer Hebrides.
Now, that does not mean it is not a fine, quality tweed. It just cannot be Harris Tweed Authority certified Harris Tweed complying with the legal requirements for its production without receiving the Orb, which is now 108 years old.