If that is supposed to be the Gunn tartan, then it is incorrect. The Gunn tartan is supposed to have narrow green stripes separating the blue and black checks:
Possibly the Harris tweed tartan shown in the aforementioned link has been misidentified and is actually another clan's sett.
I suspect it is the weathered version,have a look at this!
Even the weathered Gunn tartan has the narrow green lines separating the blue and black checks (although the green is light brown and the blue has become dove grey). The Harris tweed tartan shown on Scotweb's site is totally lacking in these stripes:
Harris Tweed tartan:
Here is the Gunn tartan in weathered colors:
Close, but no cigar!
Well, to my non artistic eye and given that weathered colours are notoriously difficult to decipher, I would suggest that the top picture is more like MacLeod of Assynt(the green one).
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