(1) The listing on Ebay says it is an original Apple band, not a knockoff. Now - whether the lister is being truthful.....
(2) The problem with Ebay and Amazon listings for the third-party knockoffs is they generally use the Apple photos, so you can't tell the difference by looking at the listings. The most obvious is the Sport Loop Band pictures, where in reality they are obviously thinner than the Apple versions and the way the velcro is put on the backs is not as well done as Apple's original versions. But again, you can't tell from the pics.