Because my jonesing is playing up today, I went to New House Highland's website just to daydream for a few minutes. I have a couple of questions that the tartan experts might be able to answer. I read about the regimental tartans that Matt offers, and I see he has arranged them thusly:

Black Watch - Highland No. 1a
Cameron of Erracht - Highland No. 4
Gordon - Highland No. 3
MacKenzie Seaforth - Highland No. 2
Stewart Hunting - Highland No. 8
Stewart Royal - Highland

I'm familiar with the convention of numbering these tartans, and I think I know that Tartan 1a is a slightly brighter variant of Tartan 1, which the Black Watch used to wear (stop me there, if I'm wrong). But there's a gap in the numbering. What happened to tartans 5, 6, and 7? Does Royal Stuart have a number?

Answers will go into my trivia file. Thanks!

The Brus