Two gauges are listed - one for sz 50 needles, with yarn double-stranded, and the other for sz 19 needles with yarn single-stranded. Both are for reverse stockinette.
Size 50 gauge:
4.5 stitches and 6 rows = 5”
Size 19 gauge:
8 stitches and 12 rows = 5”
The pattern as of 10/14/09 is now in the “Free Patterns” section of the vogue knitting site. You do have to be a member and logged in, in order to download it.