Not all knock offs come from China and the attraction isn't always a cheap price. Sometimes it's rarity. I bought what was advertised as a NOS Dura Ace One Bolt stem (HS-7400) for my '84 Paramount build this summer from an eBayer out of Eastern Europe (can't remember if it was Poland or Croatia). When I got it it came in funky packaging and just did not look quite right. I had another HS-6400 stem that came in it's original packaging so I compared the two and it was fairly obvious the Dura Ace stem was a knock of because it had casting flash (I thought these were forged?) inside the bolt holes and the threads were poorly made. Luckily eBay forced the seller to refund my money YAY!