Barb: I can only speak for myself, but you ARE explaining it clearly. My mistake came from comparing threadcounts and tartan images using only one browser window and multiple tabs. So, I was switching back and forth rather than comparing side by side, and thus having to rely on faulty and aged memory.

Your post (#17) summarizes things clearly and completely, ... and graphically. In fact you might want to edit your OP and suggest that folks skip directly to post #17 with a short stop at cajunscot's post 13.

I, too, could find nothing in either the SRT or the STA that matches the Strathmore US Air Force (Not Official). You suggest that either ...

"the USAFRPB tartan was recorded wrong in the registers or if there's a long-standing weaving error at Strathmore."

I have a couple other theories. What, if anything, prevents Strathmore (or any mill) from weaving a tartan that is a minor variation of an existing tartan and selling it under a slightly altered name? Maybe Strathmore doesn't like the green stripes and prefers gold.

Or, Matt once told me on this forum that purple was blue and red was (ancient) orange. Maybe Strathmore regards yellow as (ancient) green.

Maybe I'll email Strathmore and the SRT and see if I get a response. It can't hurt.