Very interesting. I bought a Rev B from ITW not too long ago and of course it came with the newer GT frames in both 2- and 3-wrap varieties. The kite took a hard landing at the beginning of my session this weekend after I tried out some of the extra-long custom leaders and after close inspection I noticed two tiny longitudinal hairlines at the end of one of my 3-wrap edges where it meets the ferrule. Steve from BASKL recommended ZAP-RT rubber-toughened CA as the appropriate crack-filler/adhesive so I placed an order for that (it's not on most shelves).
In the meantime I walked over to Highline Kites and asked Tom for another 3-wrap as a backup while I waited to repair the other one. It took him a while but he finally found some 3-wrap and it was NOS, ie. silver label. I was not yet aware that there were these new and old varieties. It fit on my GT center just fine and it didn't seem to feel very different but I did notice that the wrap was wider than the GT tubes. I didn't immediately notice the label and it wasn't until I got home that I looked here and sure enough here it is.
Now I guess I'm going to want to get at least one more of them from Tom, if only for my mild OCD, but it sounds like maybe I should buy him out! Do we wanna crowdfund some NOS Rev tubing? He had a ton of 4-wrap which is what took him so long finding the 3-wrap. Kidding aside, I'm more than happy to give Tom my business but wow I had no idea the rabbit hole went this far!