My apologies if that came off a bit snarky... The ties posted are silk knit, and grenadine is a weave. This doesn't help, I know. See these rundowns for a bit more intel-http://thesuitsofjamesbond.com/?p=6http://putthison.com/post/231856100/grenadinenecktieshttp://putthison.com/post/26004569210/we-got-it-for-free-the-knottery-grenadine-and Great display of the differences in grenadine weaves-http://www.samhober.com/grenadine.htm
There aren't, as far as I recall, resources to check the serials. You just want there to be one.You want to check for 3 things when looking at that brand- Thread knot/noose inside the blade, then on the box where the serial number is, you want the letters to be in all caps, and the background color of the box should be a color appearing in the tie somewhere.