Quote Originally Posted by M. A. C. Newsome View Post
Really, what we have here is a typical symmetric tartan, with two pivot points. It's just that those pivots look very similar, which can lead to confusion if someone isn't looking carefully.
True - that's what I was trying to explain with the scan and the As and Bs (which are each pivots). Where things got bogged down was in trying to explain why anyone would bother to designate an ABAC tartan, which really only has two pivots and could be equally easily called an AB tartan......!