I took a look at the link above and followed the links to look at some of the fake Winchester items, particularly locks. It is amazing how much effort has been expended to make some of these things. I then went to ebay to test my knowledge and, sure enough, there were at the very least, 2 clear examples of one of the fake Winchester locks for sale on the first page and several other suspect ones as well as many suspect miscellaneous items. Both of the locks were the "Winchester Six Lever" ones, and they had pretty high asking prices. I then took a look at the completed listings, and it appears the buyers are wise to the trick. The fakes go for about $20, and the only 'real' one looks like it went for about $200.
I am glad I have no interest in the 'high end' marketplace. It's dangerous.