Friend of mine recently bought a Ritchey stem off eBay, I went round to help him fit it and immediately recognised it as very probably a fake. I have had Ritchey WCS kit before and it's head and shoulders above the quality of the one in question.
It's got a dodgy carbon wrap over a poorly made alloy stem. Quality of finish is terrible and graphics are wrong in part.
I advised him to get in touch with the seller and ask for full refund. The seller gave him a full refund no questions asked, he just had to post it back. Kind of makes you think the seller knows it's fake???
The item number is 140911287163, I urge you all to report it to eBay and beware.