Richard, sales catalogs do come up for auction , but rarely. I was fortunate to get hold of some dupes while working at the museum since I did some reference for them.
Flipping is a term in some collectors circles where they will buy a watch, keep it for a short time, and resell it. The same term is used in buying, fixing, and reselling houses.
I don't know if it is a good idea to post your friends Ebay name here. I can't speak for Knut, but it would seem like the forum would have to do likewise for all sellers.
BTW here is a link to a photo album of a small part of my timex collection. If I put it all on there it would cost me to much for the space used.