First, I met a man once who was descended from royalty. What a deal he had for me. Fortunately I understood that my father's noble title, though passed to me after his death, and quite factual, is worth nothing in America. (And so it should be). Now, gentlemen, I could be wrong. And if so let me me say up front that I had/have no intention of disparging anyone. But the posted illustrations of the tartan appear to leave little doubt that the colors are modern. Very modern. My maternal grandmother (born and raised in Scotland) was MacGregor by way of Walker, and she told me many a time that what passes for MacGregor tartan is far too bright. The pattern, she said, was right, but the dyes were wrong. Modern aniline dyes will knock your eyes out (as does the ebay picture), but proper vegetable dyes of the period fall on the eye as gently as the morning mist.

Caution, gentlemen, is the order of the day.