Actually, the Black Watch tartan is the Campbell clan tartan. There is absolutely no difference in the sett whatsoever. Black Watch = Campbell. No difference.
In addition to being used as the Campbell clan tartan, the Black Watch is also used as a hunting tartan by Clan Grant and Clan Munro. And, because of its origins as a "government sett" it is used very often as a general use tartan by those with no clan connections.
It is not uncommon to find the same tartan shared by more than one clan, or having different names. For instance:
Campbell of Cawdor = Argyle District = MacCorquodale
Keith = Austin = Marshall
Hunter = Russel = Mitchell = Galbraith
MacIan = MacDonald of Glencoe
Morgan = Mackay Blue
MacDonald of Sleat = MacCullough
There are more, but this is what I can think of off the top of my head. What is interesting about the Black Watch, though, is not only that it is shared by three different clans (Campbell, Grant, and Munro), but that it is also a military tartan, and widely used as an all-purpose general tartan as well.
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