Very good to know, Troika! My LVCs do indeed have the red line selvage as your guideline describes.
Maybe it's my imagination, though, but I'm seeing a faded red line in the auction's selvage... Here's a close-up of that pic:
Yeah that's the thing. The pictures on the ebay auction make it evident that these are the real deal IMO.
Note the buttons, the most common numbers are actually 2, 5, & 6 denoting their manufacturing factory.
In addition, I believe that the selvedge line is actually different.
This is the vintage pic from the auction. It is plain and without stitching.
Modern ones looks like this. Pic of LVCs