Purchased two Zipp 404 wheels on Ebay. One appears genuine, the other is an obvious counterfeit. Genuine wheel has sharp embossed dimples. Counterfeit has fuzzy, shallow, barely visible dimples; Genuine wheel has embossed "Z" logo stampes into rim. Counterfeit Z logo is a sticker. Genuine wheel has "HAND MADE IN SPEEDWAY INDIANA" embossed on both sides of rim,lacking on the counterfeit. Counterfeit also has bar code on external side of rim instead of in the tire track, different spokes.