I just bought, and received both a Leather Loop band, and the Space Black link band from this seller, and the one's I got are exactly as described, engravings, (Both) Yep, polished band sides, (yep), 6 links on each side, (yep), smooth edges all around, (yep). I'm pretty much convinced I got a "pre-owned" link band for USD$125. There is one tiny light spot on the edge of one link, and other than that, it appears to be brand new. The leather loop was "New Other", and I'm very pleased with it also. I'd say that seller (at least for me) is good to go.
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I'm wondering if he's taking the bands off of genuine Apple Watches that are returned for some reason or other. Store returns, warranty replacements, etc. After all, AW's are made in China, and if he has a deal going with the factory.... Makes sense to me, that these came off of genuine Watches.